{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-105280",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T17:35:17.920015Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-16T17:37:21.498Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:hexpm:hex:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.Mix.Tasks.Hex.Package\u0027",
            "\u0027Elixir.Hex.SCM\u0027"
          ],
          "packageName": "hex",
          "packageURL": "pkg:otp/hex?repository_url=https:%2F%2Fgithub.com%2Fhexpm%2Fhex\u0026vcs_url=repository_url=git%2Bhttps:%2F%2Fgithub.com%2Fhexpm%2Fhex.git",
          "product": "hex",
          "programFiles": [
            "lib/mix/tasks/hex.package.ex",
            "lib/hex/scm.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Mix.Tasks.Hex.Package\u0027:run/1"
            },
            {
              "name": "\u0027Elixir.Hex.SCM\u0027:fetch/3"
            }
          ],
          "repo": "https://github.com/hexpm/hex",
          "vendor": "hexpm",
          "versions": [
            {
              "lessThan": "2.5.2",
              "status": "affected",
              "version": "0.20.2",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:hexpm:hex:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.Mix.Tasks.Hex.Package\u0027",
            "\u0027Elixir.Hex.SCM\u0027"
          ],
          "packageName": "hexpm/hex",
          "packageURL": "pkg:github/hexpm/hex",
          "product": "hex",
          "programFiles": [
            "lib/mix/tasks/hex.package.ex",
            "lib/hex/scm.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Mix.Tasks.Hex.Package\u0027:run/1"
            },
            {
              "name": "\u0027Elixir.Hex.SCM\u0027:fetch/3"
            }
          ],
          "repo": "https://github.com/hexpm/hex",
          "vendor": "hexpm",
          "versions": [
            {
              "changes": [
                {
                  "at": "8a14632ca6ba8a8afd2a3f2098bc267c13e13d93",
                  "status": "unaffected"
                },
                {
                  "at": "69489f8b74213f03db10169e6e5407e6d5fee512",
                  "status": "unaffected"
                }
              ],
              "lessThan": "*",
              "status": "affected",
              "version": "d1f5a085d9d4748e1f7d195e4bc39ebd77c28d9c",
              "versionType": "git"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eAffects \u003ccode\u003emix hex.package fetch\u003c/code\u003e with \u003ccode\u003e--output -\u003c/code\u003e when packages are downloaded through a mirror set with \u003ccode\u003eHEX_MIRROR_URL\u003c/code\u003e or \u003ccode\u003emirror_url\u003c/code\u003e. Downloads directly from the repository over HTTPS aren\u0027t affected unless TLS verification is broken.\u003c/p\u003e"
            },
            {
              "base64": false,
              "type": "text/markdown",
              "value": "Affects `mix hex.package fetch` with `--output -` when packages are downloaded through a mirror set with `HEX_MIRROR_URL` or `mirror_url`. Downloads directly from the repository over HTTPS aren\u0027t affected unless TLS verification is broken."
            }
          ],
          "value": "Affects mix hex.package fetch with --output - when packages are downloaded through a mirror set with HEX_MIRROR_URL or mirror_url. Downloads directly from the repository over HTTPS aren\u0027t affected unless TLS verification is broken."
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:hexpm:hex:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "2.5.2",
                  "versionStartIncluding": "0.20.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ],
          "operator": "AND"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Peter Ullrich"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Eric Meadows-J\u00f6nsson"
        },
        {
          "lang": "en",
          "type": "analyst",
          "value": "Jonatan M\u00e4nnchen / EEF"
        }
      ],
      "dateAssigned": "2026-10-10T13:01:30.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eImproper Validation of Integrity Check Value vulnerability in hexpm hex allows a package mirror to substitute the tarball that \u003ccode\u003emix hex.package fetch PACKAGE VERSION --output -\u003c/code\u003e writes to standard output.\u003c/p\u003e\n\u003cp\u003eHex compares a fetched tarball\u0027s inner and outer checksums with the repository\u0027s signed registry before writing it to a file or unpacking it. The standard output branch of \u003ccode\u003emix hex.package fetch\u003c/code\u003e writes the bytes returned by \u003ccode\u003eHex.SCM.fetch/3\u003c/code\u003e without that comparison, and \u003ccode\u003eHex.SCM.fetch/3\u003c/code\u003e doesn\u0027t verify freshly downloaded tarballs itself. When a mirror configured with \u003ccode\u003eHEX_MIRROR_URL\u003c/code\u003e or \u003ccode\u003emirror_url\u003c/code\u003e serves altered bytes, the command prints them and exits successfully, while the same fetch with \u003ccode\u003e--output FILE\u003c/code\u003e fails with a checksum mismatch.\u003c/p\u003e\n\u003cp\u003eHex also prints diagnostics to standard output while the command runs: the body of a failed HTTP response from the update check or a registry fetch, and API warnings from the \u003ccode\u003ex-hex-message\u003c/code\u003e header. A mirror that answers one of those requests with an error whose body is a tar archive gets that archive written to standard output ahead of the verified tarball, so a pipeline that unpacks standard output extracts the mirror\u0027s files. This happens even when the checksum check then fails, because the archive is already on standard output.\u003c/p\u003e\n\u003cp\u003eThis issue affects hex: from 0.20.2 before 2.5.2.\u003c/p\u003e"
            },
            {
              "base64": false,
              "type": "text/markdown",
              "value": "Improper Validation of Integrity Check Value vulnerability in hexpm hex allows a package mirror to substitute the tarball that `mix hex.package fetch PACKAGE VERSION --output -` writes to standard output.\n\nHex compares a fetched tarball\u0027s inner and outer checksums with the repository\u0027s signed registry before writing it to a file or unpacking it. The standard output branch of `mix hex.package fetch` writes the bytes returned by `Hex.SCM.fetch/3` without that comparison, and `Hex.SCM.fetch/3` doesn\u0027t verify freshly downloaded tarballs itself. When a mirror configured with `HEX_MIRROR_URL` or `mirror_url` serves altered bytes, the command prints them and exits successfully, while the same fetch with `--output FILE` fails with a checksum mismatch.\n\nHex also prints diagnostics to standard output while the command runs: the body of a failed HTTP response from the update check or a registry fetch, and API warnings from the `x-hex-message` header. A mirror that answers one of those requests with an error whose body is a tar archive gets that archive written to standard output ahead of the verified tarball, so a pipeline that unpacks standard output extracts the mirror\u0027s files. This happens even when the checksum check then fails, because the archive is already on standard output.\n\nThis issue affects hex: from 0.20.2 before 2.5.2."
            }
          ],
          "value": "Improper Validation of Integrity Check Value vulnerability in hexpm hex allows a package mirror to substitute the tarball that mix hex.package fetch PACKAGE VERSION --output - writes to standard output.\n\nHex compares a fetched tarball\u0027s inner and outer checksums with the repository\u0027s signed registry before writing it to a file or unpacking it. The standard output branch of mix hex.package fetch writes the bytes returned by Hex.SCM.fetch/3 without that comparison, and Hex.SCM.fetch/3 doesn\u0027t verify freshly downloaded tarballs itself. When a mirror configured with HEX_MIRROR_URL or mirror_url serves altered bytes, the command prints them and exits successfully, while the same fetch with --output FILE fails with a checksum mismatch.\n\nHex also prints diagnostics to standard output while the command runs: the body of a failed HTTP response from the update check or a registry fetch, and API warnings from the x-hex-message header. A mirror that answers one of those requests with an error whose body is a tar archive gets that archive written to standard output ahead of the verified tarball, so a pipeline that unpacks standard output extracts the mirror\u0027s files. This happens even when the checksum check then fails, because the archive is already on standard output.\n\nThis issue affects hex: from 0.20.2 before 2.5.2."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-186",
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003eHex treats mirrors as untrusted and relies on registry signatures and checksums for package integrity. Scripts that pipe \u003ccode\u003emix hex.package fetch --output -\u003c/code\u003e into another tool, such as an unpacker, a vendoring step or an installer, receive whatever the mirror served, so the mirror operator can deliver modified package contents that downstream steps treat as the published release.\u003c/p\u003e"
                },
                {
                  "base64": false,
                  "type": "text/markdown",
                  "value": "Hex treats mirrors as untrusted and relies on registry signatures and checksums for package integrity. Scripts that pipe `mix hex.package fetch --output -` into another tool, such as an unpacker, a vendoring step or an installer, receive whatever the mirror served, so the mirror operator can deliver modified package contents that downstream steps treat as the published release."
                }
              ],
              "value": "Hex treats mirrors as untrusted and relies on registry signatures and checksums for package integrity. Scripts that pipe mix hex.package fetch --output - into another tool, such as an unpacker, a vendoring step or an installer, receive whatever the mirror served, so the mirror operator can deliver modified package contents that downstream steps treat as the published release."
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "ACTIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-354",
              "description": "CWE-354 Improper Validation of Integrity Check Value",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-12T15:30:14.126Z",
        "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "shortName": "EEF"
      },
      "references": [
        {
          "name": "GitHub Advisory",
          "tags": [
            "related",
            "vendor-advisory"
          ],
          "url": "https://github.com/hexpm/hex/security/advisories/GHSA-98jr-23pm-vj7c"
        },
        {
          "name": "EEF CNA record for CVE-2026-105280",
          "tags": [
            "related"
          ],
          "url": "https://cna.erlef.org/cves/CVE-2026-105280.html"
        },
        {
          "name": "OSV record EEF-CVE-2026-105280",
          "tags": [
            "related"
          ],
          "url": "https://osv.dev/vulnerability/EEF-CVE-2026-105280"
        },
        {
          "name": "Introducing commit d1f5a08 in hexpm/hex",
          "tags": [
            "related"
          ],
          "url": "https://github.com/hexpm/hex/commit/d1f5a085d9d4748e1f7d195e4bc39ebd77c28d9c"
        },
        {
          "name": "Fix commit 8a14632 in hexpm/hex",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/hexpm/hex/commit/8a14632ca6ba8a8afd2a3f2098bc267c13e13d93"
        },
        {
          "name": "Fix commit 69489f8 in hexpm/hex",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/hexpm/hex/commit/69489f8b74213f03db10169e6e5407e6d5fee512"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eUpgrade Hex to 2.5.2 or later, for example with \u003ccode\u003emix local.hex\u003c/code\u003e. \u003ccode\u003emix hex.package fetch PACKAGE VERSION --output -\u003c/code\u003e then verifies the registry checksum before writing the tarball to standard output and prints its messages to standard error.\u003c/p\u003e"
            },
            {
              "base64": false,
              "type": "text/markdown",
              "value": "Upgrade Hex to 2.5.2 or later, for example with `mix local.hex`. `mix hex.package fetch PACKAGE VERSION --output -` then verifies the registry checksum before writing the tarball to standard output and prints its messages to standard error."
            }
          ],
          "value": "Upgrade Hex to 2.5.2 or later, for example with mix local.hex. mix hex.package fetch PACKAGE VERSION --output - then verifies the registry checksum before writing the tarball to standard output and prints its messages to standard error."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Hex writes unverified package tarballs to standard output in mix hex.package fetch",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eWrite the tarball to a file with \u003ccode\u003e--output FILE\u003c/code\u003e, which verifies the checksums, and read that file instead of standard output.\u003c/p\u003e"
            },
            {
              "base64": false,
              "type": "text/markdown",
              "value": "Write the tarball to a file with `--output FILE`, which verifies the checksums, and read that file instead of standard output."
            }
          ],
          "value": "Write the tarball to a file with --output FILE, which verifies the checksums, and read that file instead of standard output."
        }
      ],
      "x_proofOfConcept": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003col\u003e\n\u003cli\u003eSet \u003ccode\u003eHEX_MIRROR_URL\u003c/code\u003e to a server that returns modified bytes for \u003ccode\u003etarballs/decimal-2.4.1.tar\u003c/code\u003e and proxies everything else to repo.hex.pm.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003emix hex.package fetch decimal 2.4.1 --output -\u003c/code\u003e prints the modified bytes and exits 0.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003emix hex.package fetch decimal 2.4.1 --output decimal.tar\u003c/code\u003e fails with \u003ccode\u003eChecksum mismatch against registry (outer)\u003c/code\u003e.\u003c/li\u003e\n\u003c/ol\u003e"
            },
            {
              "base64": false,
              "type": "text/markdown",
              "value": "1. Set `HEX_MIRROR_URL` to a server that returns modified bytes for `tarballs/decimal-2.4.1.tar` and proxies everything else to repo.hex.pm.\n2. `mix hex.package fetch decimal 2.4.1 --output -` prints the modified bytes and exits 0.\n3. `mix hex.package fetch decimal 2.4.1 --output decimal.tar` fails with `Checksum mismatch against registry (outer)`."
            }
          ],
          "value": "* Set HEX_MIRROR_URL to a server that returns modified bytes for tarballs/decimal-2.4.1.tar and proxies everything else to repo.hex.pm.\n* mix hex.package fetch decimal 2.4.1 --output - prints the modified bytes and exits 0.\n* mix hex.package fetch decimal 2.4.1 --output decimal.tar fails with Checksum mismatch against registry (outer)."
        }
      ],
      "x_technicalAnalysis": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003col\u003e\n\u003cli\u003e\u003ccode\u003emix hex.package fetch PACKAGE VERSION --output -\u003c/code\u003e calls \u003ccode\u003efetch_tarball!/3\u003c/code\u003e, which calls \u003ccode\u003eHex.SCM.fetch/3\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eFor a fresh download, \u003ccode\u003eHex.SCM.fetch/3\u003c/code\u003e writes the response body to the cache and returns it without comparing it to the registry checksum.\u003c/li\u003e\n\u003cli\u003eThe standard output branch passes those bytes to \u003ccode\u003eIO.binwrite/1\u003c/code\u003e. The file and \u003ccode\u003e--unpack\u003c/code\u003e branches call \u003ccode\u003everify_inner_checksum!/4\u003c/code\u003e and \u003ccode\u003everify_outer_checksum!/4\u003c/code\u003e first.\u003c/li\u003e\n\u003cli\u003eWhile the task runs, Hex prints messages with \u003ccode\u003eHex.Shell.info/1\u003c/code\u003e, which writes to standard output. \u003ccode\u003eHex.Utils.print_error_result/1\u003c/code\u003e prints the body of an error response that way; the update checker calls it when its request for \u003ccode\u003einstalls/hex-1.x.csv\u003c/code\u003e fails, and \u003ccode\u003eHex.Registry.Server\u003c/code\u003e calls it when a registry fetch fails and the cached registry is used. \u003ccode\u003eHex.HTTP\u003c/code\u003e prints the \u003ccode\u003ex-hex-message\u003c/code\u003e warning of each response the same way. These are printed before the tarball is written, so the mirror chooses bytes that come before the tarball on standard output.\u003c/li\u003e\n\u003c/ol\u003e"
            },
            {
              "base64": false,
              "type": "text/markdown",
              "value": "1. `mix hex.package fetch PACKAGE VERSION --output -` calls `fetch_tarball!/3`, which calls `Hex.SCM.fetch/3`.\n2. For a fresh download, `Hex.SCM.fetch/3` writes the response body to the cache and returns it without comparing it to the registry checksum.\n3. The standard output branch passes those bytes to `IO.binwrite/1`. The file and `--unpack` branches call `verify_inner_checksum!/4` and `verify_outer_checksum!/4` first.\n4. While the task runs, Hex prints messages with `Hex.Shell.info/1`, which writes to standard output. `Hex.Utils.print_error_result/1` prints the body of an error response that way; the update checker calls it when its request for `installs/hex-1.x.csv` fails, and `Hex.Registry.Server` calls it when a registry fetch fails and the cached registry is used. `Hex.HTTP` prints the `x-hex-message` warning of each response the same way. These are printed before the tarball is written, so the mirror chooses bytes that come before the tarball on standard output."
            }
          ],
          "value": "* mix hex.package fetch PACKAGE VERSION --output - calls fetch_tarball!/3, which calls Hex.SCM.fetch/3.\n* For a fresh download, Hex.SCM.fetch/3 writes the response body to the cache and returns it without comparing it to the registry checksum.\n* The standard output branch passes those bytes to IO.binwrite/1. The file and --unpack branches call verify_inner_checksum!/4 and verify_outer_checksum!/4 first.\n* While the task runs, Hex prints messages with Hex.Shell.info/1, which writes to standard output. Hex.Utils.print_error_result/1 prints the body of an error response that way; the update checker calls it when its request for installs/hex-1.x.csv fails, and Hex.Registry.Server calls it when a registry fetch fails and the cached registry is used. Hex.HTTP prints the x-hex-message warning of each response the same way. These are printed before the tarball is written, so the mirror chooses bytes that come before the tarball on standard output."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
    "assignerShortName": "EEF",
    "cveId": "CVE-2026-105280",
    "datePublished": "2026-10-12T15:30:14.126Z",
    "dateReserved": "2026-10-08T13:45:02.134Z",
    "dateUpdated": "2026-10-16T17:37:21.498Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-105280\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T17:35:17.920015Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T17:37:17.455Z\"}}], \"cna\": {\"title\": \"Hex writes unverified package tarballs to standard output in mix hex.package fetch\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Peter Ullrich\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Eric Meadows-J\\u00f6nsson\"}, {\"lang\": \"en\", \"type\": \"analyst\", \"value\": \"Jonatan M\\u00e4nnchen / EEF\"}], \"impacts\": [{\"capecId\": \"CAPEC-186\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"Hex treats mirrors as untrusted and relies on registry signatures and checksums for package integrity. Scripts that pipe mix hex.package fetch --output - into another tool, such as an unpacker, a vendoring step or an installer, receive whatever the mirror served, so the mirror operator can deliver modified package contents that downstream steps treat as the published release.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eHex treats mirrors as untrusted and relies on registry signatures and checksums for package integrity. Scripts that pipe \u003ccode\u003emix hex.package fetch --output -\u003c/code\u003e into another tool, such as an unpacker, a vendoring step or an installer, receive whatever the mirror served, so the mirror operator can deliver modified package contents that downstream steps treat as the published release.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"Hex treats mirrors as untrusted and relies on registry signatures and checksums for package integrity. Scripts that pipe `mix hex.package fetch --output -` into another tool, such as an unpacker, a vendoring step or an installer, receive whatever the mirror served, so the mirror operator can deliver modified package contents that downstream steps treat as the published release.\", \"base64\": false}]}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 6.9, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"ACTIVE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"HIGH\", \"vulnIntegrityImpact\": \"HIGH\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:hexpm:hex:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/hexpm/hex\", \"vendor\": \"hexpm\", \"modules\": [\"\u0027Elixir.Mix.Tasks.Hex.Package\u0027\", \"\u0027Elixir.Hex.SCM\u0027\"], \"product\": \"hex\", \"versions\": [{\"status\": \"affected\", \"version\": \"0.20.2\", \"lessThan\": \"2.5.2\", \"versionType\": \"semver\"}], \"packageURL\": \"pkg:otp/hex?repository_url=https:%2F%2Fgithub.com%2Fhexpm%2Fhex\u0026vcs_url=repository_url=git%2Bhttps:%2F%2Fgithub.com%2Fhexpm%2Fhex.git\", \"packageName\": \"hex\", \"programFiles\": [\"lib/mix/tasks/hex.package.ex\", \"lib/hex/scm.ex\"], \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.Mix.Tasks.Hex.Package\u0027:run/1\"}, {\"name\": \"\u0027Elixir.Hex.SCM\u0027:fetch/3\"}]}, {\"cpes\": [\"cpe:2.3:a:hexpm:hex:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/hexpm/hex\", \"vendor\": \"hexpm\", \"modules\": [\"\u0027Elixir.Mix.Tasks.Hex.Package\u0027\", \"\u0027Elixir.Hex.SCM\u0027\"], \"product\": \"hex\", \"versions\": [{\"status\": \"affected\", \"changes\": [{\"at\": \"8a14632ca6ba8a8afd2a3f2098bc267c13e13d93\", \"status\": \"unaffected\"}, {\"at\": \"69489f8b74213f03db10169e6e5407e6d5fee512\", \"status\": \"unaffected\"}], \"version\": \"d1f5a085d9d4748e1f7d195e4bc39ebd77c28d9c\", \"lessThan\": \"*\", \"versionType\": \"git\"}], \"packageURL\": \"pkg:github/hexpm/hex\", \"packageName\": \"hexpm/hex\", \"programFiles\": [\"lib/mix/tasks/hex.package.ex\", \"lib/hex/scm.ex\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.Mix.Tasks.Hex.Package\u0027:run/1\"}, {\"name\": \"\u0027Elixir.Hex.SCM\u0027:fetch/3\"}]}], \"solutions\": [{\"lang\": \"en\", \"value\": \"Upgrade Hex to 2.5.2 or later, for example with mix local.hex. mix hex.package fetch PACKAGE VERSION --output - then verifies the registry checksum before writing the tarball to standard output and prints its messages to standard error.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eUpgrade Hex to 2.5.2 or later, for example with \u003ccode\u003emix local.hex\u003c/code\u003e. \u003ccode\u003emix hex.package fetch PACKAGE VERSION --output -\u003c/code\u003e then verifies the registry checksum before writing the tarball to standard output and prints its messages to standard error.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"Upgrade Hex to 2.5.2 or later, for example with `mix local.hex`. `mix hex.package fetch PACKAGE VERSION --output -` then verifies the registry checksum before writing the tarball to standard output and prints its messages to standard error.\", \"base64\": false}]}], \"references\": [{\"url\": \"https://github.com/hexpm/hex/security/advisories/GHSA-98jr-23pm-vj7c\", \"name\": \"GitHub Advisory\", \"tags\": [\"related\", \"vendor-advisory\"]}, {\"url\": \"https://cna.erlef.org/cves/CVE-2026-105280.html\", \"name\": \"EEF CNA record for CVE-2026-105280\", \"tags\": [\"related\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-105280\", \"name\": \"OSV record EEF-CVE-2026-105280\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/hexpm/hex/commit/d1f5a085d9d4748e1f7d195e4bc39ebd77c28d9c\", \"name\": \"Introducing commit d1f5a08 in hexpm/hex\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/hexpm/hex/commit/8a14632ca6ba8a8afd2a3f2098bc267c13e13d93\", \"name\": \"Fix commit 8a14632 in hexpm/hex\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/hexpm/hex/commit/69489f8b74213f03db10169e6e5407e6d5fee512\", \"name\": \"Fix commit 69489f8 in hexpm/hex\", \"tags\": [\"patch\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Write the tarball to a file with --output FILE, which verifies the checksums, and read that file instead of standard output.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eWrite the tarball to a file with \u003ccode\u003e--output FILE\u003c/code\u003e, which verifies the checksums, and read that file instead of standard output.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"Write the tarball to a file with `--output FILE`, which verifies the checksums, and read that file instead of standard output.\", \"base64\": false}]}], \"dateAssigned\": \"2026-10-10T13:01:30.000Z\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"Improper Validation of Integrity Check Value vulnerability in hexpm hex allows a package mirror to substitute the tarball that mix hex.package fetch PACKAGE VERSION --output - writes to standard output.\\n\\nHex compares a fetched tarball\u0027s inner and outer checksums with the repository\u0027s signed registry before writing it to a file or unpacking it. The standard output branch of mix hex.package fetch writes the bytes returned by Hex.SCM.fetch/3 without that comparison, and Hex.SCM.fetch/3 doesn\u0027t verify freshly downloaded tarballs itself. When a mirror configured with HEX_MIRROR_URL or mirror_url serves altered bytes, the command prints them and exits successfully, while the same fetch with --output FILE fails with a checksum mismatch.\\n\\nHex also prints diagnostics to standard output while the command runs: the body of a failed HTTP response from the update check or a registry fetch, and API warnings from the x-hex-message header. A mirror that answers one of those requests with an error whose body is a tar archive gets that archive written to standard output ahead of the verified tarball, so a pipeline that unpacks standard output extracts the mirror\u0027s files. This happens even when the checksum check then fails, because the archive is already on standard output.\\n\\nThis issue affects hex: from 0.20.2 before 2.5.2.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eImproper Validation of Integrity Check Value vulnerability in hexpm hex allows a package mirror to substitute the tarball that \u003ccode\u003emix hex.package fetch PACKAGE VERSION --output -\u003c/code\u003e writes to standard output.\u003c/p\u003e\\n\u003cp\u003eHex compares a fetched tarball\u0027s inner and outer checksums with the repository\u0027s signed registry before writing it to a file or unpacking it. The standard output branch of \u003ccode\u003emix hex.package fetch\u003c/code\u003e writes the bytes returned by \u003ccode\u003eHex.SCM.fetch/3\u003c/code\u003e without that comparison, and \u003ccode\u003eHex.SCM.fetch/3\u003c/code\u003e doesn\u0027t verify freshly downloaded tarballs itself. When a mirror configured with \u003ccode\u003eHEX_MIRROR_URL\u003c/code\u003e or \u003ccode\u003emirror_url\u003c/code\u003e serves altered bytes, the command prints them and exits successfully, while the same fetch with \u003ccode\u003e--output FILE\u003c/code\u003e fails with a checksum mismatch.\u003c/p\u003e\\n\u003cp\u003eHex also prints diagnostics to standard output while the command runs: the body of a failed HTTP response from the update check or a registry fetch, and API warnings from the \u003ccode\u003ex-hex-message\u003c/code\u003e header. A mirror that answers one of those requests with an error whose body is a tar archive gets that archive written to standard output ahead of the verified tarball, so a pipeline that unpacks standard output extracts the mirror\u0027s files. This happens even when the checksum check then fails, because the archive is already on standard output.\u003c/p\u003e\\n\u003cp\u003eThis issue affects hex: from 0.20.2 before 2.5.2.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"Improper Validation of Integrity Check Value vulnerability in hexpm hex allows a package mirror to substitute the tarball that `mix hex.package fetch PACKAGE VERSION --output -` writes to standard output.\\n\\nHex compares a fetched tarball\u0027s inner and outer checksums with the repository\u0027s signed registry before writing it to a file or unpacking it. The standard output branch of `mix hex.package fetch` writes the bytes returned by `Hex.SCM.fetch/3` without that comparison, and `Hex.SCM.fetch/3` doesn\u0027t verify freshly downloaded tarballs itself. When a mirror configured with `HEX_MIRROR_URL` or `mirror_url` serves altered bytes, the command prints them and exits successfully, while the same fetch with `--output FILE` fails with a checksum mismatch.\\n\\nHex also prints diagnostics to standard output while the command runs: the body of a failed HTTP response from the update check or a registry fetch, and API warnings from the `x-hex-message` header. A mirror that answers one of those requests with an error whose body is a tar archive gets that archive written to standard output ahead of the verified tarball, so a pipeline that unpacks standard output extracts the mirror\u0027s files. This happens even when the checksum check then fails, because the archive is already on standard output.\\n\\nThis issue affects hex: from 0.20.2 before 2.5.2.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-354\", \"description\": \"CWE-354 Improper Validation of Integrity Check Value\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"Affects mix hex.package fetch with --output - when packages are downloaded through a mirror set with HEX_MIRROR_URL or mirror_url. Downloads directly from the repository over HTTPS aren\u0027t affected unless TLS verification is broken.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eAffects \u003ccode\u003emix hex.package fetch\u003c/code\u003e with \u003ccode\u003e--output -\u003c/code\u003e when packages are downloaded through a mirror set with \u003ccode\u003eHEX_MIRROR_URL\u003c/code\u003e or \u003ccode\u003emirror_url\u003c/code\u003e. Downloads directly from the repository over HTTPS aren\u0027t affected unless TLS verification is broken.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"Affects `mix hex.package fetch` with `--output -` when packages are downloaded through a mirror set with `HEX_MIRROR_URL` or `mirror_url`. Downloads directly from the repository over HTTPS aren\u0027t affected unless TLS verification is broken.\", \"base64\": false}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:hexpm:hex:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.5.2\", \"versionStartIncluding\": \"0.20.2\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-10-12T15:30:14.126Z\"}, \"x_proofOfConcept\": [{\"lang\": \"en\", \"value\": \"* Set HEX_MIRROR_URL to a server that returns modified bytes for tarballs/decimal-2.4.1.tar and proxies everything else to repo.hex.pm.\\n* mix hex.package fetch decimal 2.4.1 --output - prints the modified bytes and exits 0.\\n* mix hex.package fetch decimal 2.4.1 --output decimal.tar fails with Checksum mismatch against registry (outer).\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003col\u003e\\n\u003cli\u003eSet \u003ccode\u003eHEX_MIRROR_URL\u003c/code\u003e to a server that returns modified bytes for \u003ccode\u003etarballs/decimal-2.4.1.tar\u003c/code\u003e and proxies everything else to repo.hex.pm.\u003c/li\u003e\\n\u003cli\u003e\u003ccode\u003emix hex.package fetch decimal 2.4.1 --output -\u003c/code\u003e prints the modified bytes and exits 0.\u003c/li\u003e\\n\u003cli\u003e\u003ccode\u003emix hex.package fetch decimal 2.4.1 --output decimal.tar\u003c/code\u003e fails with \u003ccode\u003eChecksum mismatch against registry (outer)\u003c/code\u003e.\u003c/li\u003e\\n\u003c/ol\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"1. Set `HEX_MIRROR_URL` to a server that returns modified bytes for `tarballs/decimal-2.4.1.tar` and proxies everything else to repo.hex.pm.\\n2. `mix hex.package fetch decimal 2.4.1 --output -` prints the modified bytes and exits 0.\\n3. `mix hex.package fetch decimal 2.4.1 --output decimal.tar` fails with `Checksum mismatch against registry (outer)`.\", \"base64\": false}]}], \"x_technicalAnalysis\": [{\"lang\": \"en\", \"value\": \"* mix hex.package fetch PACKAGE VERSION --output - calls fetch_tarball!/3, which calls Hex.SCM.fetch/3.\\n* For a fresh download, Hex.SCM.fetch/3 writes the response body to the cache and returns it without comparing it to the registry checksum.\\n* The standard output branch passes those bytes to IO.binwrite/1. The file and --unpack branches call verify_inner_checksum!/4 and verify_outer_checksum!/4 first.\\n* While the task runs, Hex prints messages with Hex.Shell.info/1, which writes to standard output. Hex.Utils.print_error_result/1 prints the body of an error response that way; the update checker calls it when its request for installs/hex-1.x.csv fails, and Hex.Registry.Server calls it when a registry fetch fails and the cached registry is used. Hex.HTTP prints the x-hex-message warning of each response the same way. These are printed before the tarball is written, so the mirror chooses bytes that come before the tarball on standard output.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003col\u003e\\n\u003cli\u003e\u003ccode\u003emix hex.package fetch PACKAGE VERSION --output -\u003c/code\u003e calls \u003ccode\u003efetch_tarball!/3\u003c/code\u003e, which calls \u003ccode\u003eHex.SCM.fetch/3\u003c/code\u003e.\u003c/li\u003e\\n\u003cli\u003eFor a fresh download, \u003ccode\u003eHex.SCM.fetch/3\u003c/code\u003e writes the response body to the cache and returns it without comparing it to the registry checksum.\u003c/li\u003e\\n\u003cli\u003eThe standard output branch passes those bytes to \u003ccode\u003eIO.binwrite/1\u003c/code\u003e. The file and \u003ccode\u003e--unpack\u003c/code\u003e branches call \u003ccode\u003everify_inner_checksum!/4\u003c/code\u003e and \u003ccode\u003everify_outer_checksum!/4\u003c/code\u003e first.\u003c/li\u003e\\n\u003cli\u003eWhile the task runs, Hex prints messages with \u003ccode\u003eHex.Shell.info/1\u003c/code\u003e, which writes to standard output. \u003ccode\u003eHex.Utils.print_error_result/1\u003c/code\u003e prints the body of an error response that way; the update checker calls it when its request for \u003ccode\u003einstalls/hex-1.x.csv\u003c/code\u003e fails, and \u003ccode\u003eHex.Registry.Server\u003c/code\u003e calls it when a registry fetch fails and the cached registry is used. \u003ccode\u003eHex.HTTP\u003c/code\u003e prints the \u003ccode\u003ex-hex-message\u003c/code\u003e warning of each response the same way. These are printed before the tarball is written, so the mirror chooses bytes that come before the tarball on standard output.\u003c/li\u003e\\n\u003c/ol\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"1. `mix hex.package fetch PACKAGE VERSION --output -` calls `fetch_tarball!/3`, which calls `Hex.SCM.fetch/3`.\\n2. For a fresh download, `Hex.SCM.fetch/3` writes the response body to the cache and returns it without comparing it to the registry checksum.\\n3. The standard output branch passes those bytes to `IO.binwrite/1`. The file and `--unpack` branches call `verify_inner_checksum!/4` and `verify_outer_checksum!/4` first.\\n4. While the task runs, Hex prints messages with `Hex.Shell.info/1`, which writes to standard output. `Hex.Utils.print_error_result/1` prints the body of an error response that way; the update checker calls it when its request for `installs/hex-1.x.csv` fails, and `Hex.Registry.Server` calls it when a registry fetch fails and the cached registry is used. `Hex.HTTP` prints the `x-hex-message` warning of each response the same way. These are printed before the tarball is written, so the mirror chooses bytes that come before the tarball on standard output.\", \"base64\": false}]}]}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-105280\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T17:37:21.498Z\", \"dateReserved\": \"2026-10-08T13:45:02.134Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-10-12T15:30:14.126Z\", \"assignerShortName\": \"EEF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}