CVE-2026-80255 (GCVE-0-2026-80255)
Vulnerability from cvelistv5
Published
2026-09-06 17:48
Modified
2026-09-15 06:03
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-201 - Information Exposure Through Sent Data
Summary
A `Set-Cookie:` header using tab (horizontal tab, ASCII code 9) instead of space (ascii code 32) immediately before the `Secure` attribute causes curl to store the cookie without its Secure flag. The cookie might then wrongfully be sent over plaintext HTTP on subsequent requests to the same host.
References
Impacted products
Vendor Product Version
curl curl Version: 8.13.0   ≤
Version: 8.15.0   ≤
Version: 8.17.0   ≤
Version: 8.21.0   ≤
Create a notification for this product.
   curl curl Version: 1aea05a6c2699e80c75936d58569851555acd603
 Create a notification for this product.
   curl curl Version: 8.21.0
Version: 8.20.0
Version: 8.19.0
Version: 8.18.0
Version: 8.17.0
Version: 8.16.0
Version: 8.15.0
Version: 8.14.1
Version: 8.14.0
Version: 8.13.0
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-80255",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-08T18:45:09.883106Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-201",
                "description": "CWE-201 Insertion of Sensitive Information Into Sent Data",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-08T18:45:49.180Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://hackerone.com/reports/3972395"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "curl",
          "vendor": "curl",
          "versions": [
            {
              "lessThan": "8.14.2",
              "status": "affected",
              "version": "8.13.0",
              "versionType": "semver"
            },
            {
              "lessThan": "8.16.1",
              "status": "affected",
              "version": "8.15.0",
              "versionType": "semver"
            },
            {
              "lessThan": "8.20.1",
              "status": "affected",
              "version": "8.17.0",
              "versionType": "semver"
            },
            {
              "lessThan": "8.22.0",
              "status": "affected",
              "version": "8.21.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "curl",
          "repo": "https://github.com/curl/curl.git",
          "vendor": "curl",
          "versions": [
            {
              "lessThan": "4f6aa41a0145e930e766775dbe860883d350aa0a",
              "status": "affected",
              "version": "1aea05a6c2699e80c75936d58569851555acd603",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "curl",
          "vendor": "curl",
          "versions": [
            {
              "status": "affected",
              "version": "8.21.0"
            },
            {
              "status": "affected",
              "version": "8.20.0"
            },
            {
              "status": "affected",
              "version": "8.19.0"
            },
            {
              "status": "affected",
              "version": "8.18.0"
            },
            {
              "status": "affected",
              "version": "8.17.0"
            },
            {
              "status": "affected",
              "version": "8.16.0"
            },
            {
              "status": "affected",
              "version": "8.15.0"
            },
            {
              "status": "affected",
              "version": "8.14.1"
            },
            {
              "status": "affected",
              "version": "8.14.0"
            },
            {
              "status": "affected",
              "version": "8.13.0"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Stanislav Fort (Aisle Research)"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Daniel Stenberg"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A `Set-Cookie:` header using tab (horizontal tab, ASCII code 9) instead of\nspace (ascii code 32) immediately before the `Secure` attribute causes curl to\nstore the cookie without its Secure flag. The cookie might then wrongfully be\nsent over plaintext HTTP on subsequent requests to the same host."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-201",
              "description": "Information Exposure Through Sent Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-15T06:03:13.400Z",
        "orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "shortName": "curl"
      },
      "references": [
        {
          "url": "https://curl.se/docs/CVE-2026-80255.json"
        },
        {
          "url": "https://curl.se/docs/CVE-2026-80255.html"
        },
        {
          "url": "https://hackerone.com/reports/3972395"
        }
      ],
      "title": "secure cookie attribute bypass with tab",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      },
      "x_osv": {
        "affected": [
          {
            "ranges": [
              {
                "events": [
                  {
                    "introduced": "8.13.0"
                  },
                  {
                    "fixed": "8.14.2"
                  },
                  {
                    "introduced": "8.15.0"
                  },
                  {
                    "fixed": "8.16.1"
                  },
                  {
                    "introduced": "8.17.0"
                  },
                  {
                    "fixed": "8.20.1"
                  },
                  {
                    "introduced": "8.21.0"
                  },
                  {
                    "fixed": "8.22.0"
                  }
                ],
                "type": "SEMVER"
              },
              {
                "events": [
                  {
                    "introduced": "1aea05a6c2699e80c75936d58569851555acd603"
                  },
                  {
                    "fixed": "4f6aa41a0145e930e766775dbe860883d350aa0a"
                  }
                ],
                "repo": "https://github.com/curl/curl.git",
                "type": "GIT"
              }
            ],
            "versions": [
              "8.21.0",
              "8.20.0",
              "8.19.0",
              "8.18.0",
              "8.17.0",
              "8.16.0",
              "8.15.0",
              "8.14.1",
              "8.14.0",
              "8.13.0"
            ]
          }
        ],
        "aliases": [
          "CVE-2026-80255"
        ],
        "credits": [
          {
            "name": "Stanislav Fort (Aisle Research)",
            "type": "finder"
          },
          {
            "name": "Daniel Stenberg",
            "type": "remediation developer"
          }
        ],
        "database_specific": {
          "CWE": {
            "desc": "Information Exposure Through Sent Data",
            "id": "CWE-201"
          },
          "URL": "https://curl.se/docs/CVE-2026-80255.json",
          "affects": "both",
          "issue": "https://hackerone.com/reports/3972395",
          "last_affected": "8.21.0",
          "package": "curl",
          "severity": "Low",
          "www": "https://curl.se/docs/CVE-2026-80255.html"
        },
        "details": "A `Set-Cookie:` header using tab (horizontal tab, ASCII code 9) instead of\nspace (ascii code 32) immediately before the `Secure` attribute causes curl to\nstore the cookie without its Secure flag. The cookie might then wrongfully be\nsent over plaintext HTTP on subsequent requests to the same host.",
        "id": "CURL-CVE-2026-80255",
        "modified": "2026-09-07T10:34:51.00Z",
        "published": "2026-09-02T08:00:00.00Z",
        "schema_version": "1.5.0",
        "summary": "secure cookie attribute bypass with tab"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
    "assignerShortName": "curl",
    "cveId": "CVE-2026-80255",
    "datePublished": "2026-09-06T17:48:54.275Z",
    "dateReserved": "2026-08-26T06:25:58.220Z",
    "dateUpdated": "2026-09-15T06:03:13.400Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-80255\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-08T18:45:09.883106Z\"}}}], \"references\": [{\"url\": \"https://hackerone.com/reports/3972395\", \"tags\": [\"exploit\"]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-201\", \"description\": \"CWE-201 Insertion of Sensitive Information Into Sent Data\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-08T18:45:43.369Z\"}}], \"cna\": {\"title\": \"secure cookie attribute bypass with tab\", \"x_osv\": {\"id\": \"CURL-CVE-2026-80255\", \"aliases\": [\"CVE-2026-80255\"], \"credits\": [{\"name\": \"Stanislav Fort (Aisle Research)\", \"type\": \"finder\"}, {\"name\": \"Daniel Stenberg\", \"type\": \"remediation developer\"}], \"details\": \"A `Set-Cookie:` header using tab (horizontal tab, ASCII code 9) instead of\\nspace (ascii code 32) immediately before the `Secure` attribute causes curl to\\nstore the cookie without its Secure flag. The cookie might then wrongfully be\\nsent over plaintext HTTP on subsequent requests to the same host.\", \"summary\": \"secure cookie attribute bypass with tab\", \"affected\": [{\"ranges\": [{\"type\": \"SEMVER\", \"events\": [{\"introduced\": \"8.13.0\"}, {\"fixed\": \"8.14.2\"}, {\"introduced\": \"8.15.0\"}, {\"fixed\": \"8.16.1\"}, {\"introduced\": \"8.17.0\"}, {\"fixed\": \"8.20.1\"}, {\"introduced\": \"8.21.0\"}, {\"fixed\": \"8.22.0\"}]}, {\"repo\": \"https://github.com/curl/curl.git\", \"type\": \"GIT\", \"events\": [{\"introduced\": \"1aea05a6c2699e80c75936d58569851555acd603\"}, {\"fixed\": \"4f6aa41a0145e930e766775dbe860883d350aa0a\"}]}], \"versions\": [\"8.21.0\", \"8.20.0\", \"8.19.0\", \"8.18.0\", \"8.17.0\", \"8.16.0\", \"8.15.0\", \"8.14.1\", \"8.14.0\", \"8.13.0\"]}], \"modified\": \"2026-09-07T10:34:51.00Z\", \"published\": \"2026-09-02T08:00:00.00Z\", \"schema_version\": \"1.5.0\", \"database_specific\": {\"CWE\": {\"id\": \"CWE-201\", \"desc\": \"Information Exposure Through Sent Data\"}, \"URL\": \"https://curl.se/docs/CVE-2026-80255.json\", \"www\": \"https://curl.se/docs/CVE-2026-80255.html\", \"issue\": \"https://hackerone.com/reports/3972395\", \"affects\": \"both\", \"package\": \"curl\", \"severity\": \"Low\", \"last_affected\": \"8.21.0\"}}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Stanislav Fort (Aisle Research)\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Daniel Stenberg\"}], \"affected\": [{\"vendor\": \"curl\", \"product\": \"curl\", \"versions\": [{\"status\": \"affected\", \"version\": \"8.13.0\", \"lessThan\": \"8.14.2\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"8.15.0\", \"lessThan\": \"8.16.1\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"8.17.0\", \"lessThan\": \"8.20.1\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"8.21.0\", \"lessThan\": \"8.22.0\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://github.com/curl/curl.git\", \"vendor\": \"curl\", \"product\": \"curl\", \"versions\": [{\"status\": \"affected\", \"version\": \"1aea05a6c2699e80c75936d58569851555acd603\", \"lessThan\": \"4f6aa41a0145e930e766775dbe860883d350aa0a\", \"versionType\": \"git\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"curl\", \"product\": \"curl\", \"versions\": [{\"status\": \"affected\", \"version\": \"8.21.0\"}, {\"status\": \"affected\", \"version\": \"8.20.0\"}, {\"status\": \"affected\", \"version\": \"8.19.0\"}, {\"status\": \"affected\", \"version\": \"8.18.0\"}, {\"status\": \"affected\", \"version\": \"8.17.0\"}, {\"status\": \"affected\", \"version\": \"8.16.0\"}, {\"status\": \"affected\", \"version\": \"8.15.0\"}, {\"status\": \"affected\", \"version\": \"8.14.1\"}, {\"status\": \"affected\", \"version\": \"8.14.0\"}, {\"status\": \"affected\", \"version\": \"8.13.0\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://curl.se/docs/CVE-2026-80255.json\"}, {\"url\": \"https://curl.se/docs/CVE-2026-80255.html\"}, {\"url\": \"https://hackerone.com/reports/3972395\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A `Set-Cookie:` header using tab (horizontal tab, ASCII code 9) instead of\\nspace (ascii code 32) immediately before the `Secure` attribute causes curl to\\nstore the cookie without its Secure flag. The cookie might then wrongfully be\\nsent over plaintext HTTP on subsequent requests to the same host.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-201\", \"description\": \"Information Exposure Through Sent Data\"}]}], \"providerMetadata\": {\"orgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"shortName\": \"curl\", \"dateUpdated\": \"2026-09-15T06:03:13.400Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-80255\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-15T06:03:13.400Z\", \"dateReserved\": \"2026-08-26T06:25:58.220Z\", \"assignerOrgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"datePublished\": \"2026-09-06T17:48:54.275Z\", \"assignerShortName\": \"curl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.