cvelistv5 - cve-2026-33416

CVE-2026-33416 (GCVE-0-2026-33416)

Vulnerability from cvelistv5

Published

2026-03-26 16:48

Modified

2026-04-01 03:55

Severity ?

7.5 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE

CWE-416 - Use After Free

Summary

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.2.1 through 1.6.55, `png_set_tRNS` and `png_set_PLTE` each alias a heap-allocated buffer between `png_struct` and `png_info`, sharing a single allocation across two structs with independent lifetimes. The `trans_alpha` aliasing has been present since at least libpng 1.0, and the `palette` aliasing since at least 1.2.1. Both affect all prior release lines `png_set_tRNS` sets `png_ptr->trans_alpha = info_ptr->trans_alpha` (256-byte buffer) and `png_set_PLTE` sets `info_ptr->palette = png_ptr->palette` (768-byte buffer). In both cases, calling `png_free_data` (with `PNG_FREE_TRNS` or `PNG_FREE_PLTE`) frees the buffer through `info_ptr` while the corresponding `png_ptr` pointer remains dangling. Subsequent row-transform functions dereference and, in some code paths, write to the freed memory. A second call to `png_set_tRNS` or `png_set_PLTE` has the same effect, because both functions call `png_free_data` internally before reallocating the `info_ptr` buffer. Version 1.6.56 fixes the issue.

References

URL

Tags

	https://github.com/pnggroup/libpng/security/advisories/GHSA-m4pc-p4q3-4c7j	x_refsource_CONFIRM
	https://github.com/pnggroup/libpng/pull/824	x_refsource_MISC
	https://github.com/pnggroup/libpng/commit/23019269764e35ed8458e517f1897bd3c54820eb	x_refsource_MISC
	https://github.com/pnggroup/libpng/commit/7ea9eea884a2328cc7fdcb3c0c00246a50d90667	x_refsource_MISC
	https://github.com/pnggroup/libpng/commit/a3a21443ed12bfa1ef46fa0d4fb2b74a0fa34a25	x_refsource_MISC
	https://github.com/pnggroup/libpng/commit/c1b0318b393c90679e6fa5bc1d329fd5d5012ec1	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	pnggroup	libpng	Version: >= 1.2.1, < 1.6.56

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33416",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-31T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-01T03:55:17.603Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "libpng",
          "vendor": "pnggroup",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.2.1, \u003c 1.6.56"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.2.1 through 1.6.55, `png_set_tRNS` and `png_set_PLTE` each alias a heap-allocated buffer between `png_struct` and `png_info`, sharing a single allocation across two structs with independent lifetimes. The `trans_alpha` aliasing has been present since at least libpng 1.0, and the `palette` aliasing since at least 1.2.1. Both affect all prior release lines `png_set_tRNS` sets `png_ptr-\u003etrans_alpha = info_ptr-\u003etrans_alpha` (256-byte buffer) and `png_set_PLTE` sets `info_ptr-\u003epalette = png_ptr-\u003epalette` (768-byte buffer). In both cases, calling `png_free_data` (with `PNG_FREE_TRNS` or `PNG_FREE_PLTE`) frees the buffer through `info_ptr` while the corresponding `png_ptr` pointer remains dangling. Subsequent row-transform functions dereference and, in some code paths, write to the freed memory. A second call to `png_set_tRNS` or `png_set_PLTE` has the same effect, because both functions call `png_free_data` internally before reallocating the `info_ptr` buffer. Version 1.6.56 fixes the issue."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-416",
              "description": "CWE-416: Use After Free",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-26T16:48:54.174Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/pnggroup/libpng/security/advisories/GHSA-m4pc-p4q3-4c7j",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/pnggroup/libpng/security/advisories/GHSA-m4pc-p4q3-4c7j"
        },
        {
          "name": "https://github.com/pnggroup/libpng/pull/824",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pnggroup/libpng/pull/824"
        },
        {
          "name": "https://github.com/pnggroup/libpng/commit/23019269764e35ed8458e517f1897bd3c54820eb",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pnggroup/libpng/commit/23019269764e35ed8458e517f1897bd3c54820eb"
        },
        {
          "name": "https://github.com/pnggroup/libpng/commit/7ea9eea884a2328cc7fdcb3c0c00246a50d90667",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pnggroup/libpng/commit/7ea9eea884a2328cc7fdcb3c0c00246a50d90667"
        },
        {
          "name": "https://github.com/pnggroup/libpng/commit/a3a21443ed12bfa1ef46fa0d4fb2b74a0fa34a25",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pnggroup/libpng/commit/a3a21443ed12bfa1ef46fa0d4fb2b74a0fa34a25"
        },
        {
          "name": "https://github.com/pnggroup/libpng/commit/c1b0318b393c90679e6fa5bc1d329fd5d5012ec1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pnggroup/libpng/commit/c1b0318b393c90679e6fa5bc1d329fd5d5012ec1"
        }
      ],
      "source": {
        "advisory": "GHSA-m4pc-p4q3-4c7j",
        "discovery": "UNKNOWN"
      },
      "title": "LIBPNG has use-after-free via pointer aliasing in `png_set_tRNS` and `png_set_PLTE`"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-33416",
    "datePublished": "2026-03-26T16:48:54.174Z",
    "dateReserved": "2026-03-19T17:02:34.172Z",
    "dateUpdated": "2026-04-01T03:55:17.603Z",
    "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-2026-33416\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-03-26T19:49:05.196519Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-03-26T19:50:41.189Z\"}}], \"cna\": {\"title\": \"LIBPNG has use-after-free via pointer aliasing in `png_set_tRNS` and `png_set_PLTE`\", \"source\": {\"advisory\": \"GHSA-m4pc-p4q3-4c7j\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"pnggroup\", \"product\": \"libpng\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003e= 1.2.1, \u003c 1.6.56\"}]}], \"references\": [{\"url\": \"https://github.com/pnggroup/libpng/security/advisories/GHSA-m4pc-p4q3-4c7j\", \"name\": \"https://github.com/pnggroup/libpng/security/advisories/GHSA-m4pc-p4q3-4c7j\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/pnggroup/libpng/pull/824\", \"name\": \"https://github.com/pnggroup/libpng/pull/824\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/pnggroup/libpng/commit/23019269764e35ed8458e517f1897bd3c54820eb\", \"name\": \"https://github.com/pnggroup/libpng/commit/23019269764e35ed8458e517f1897bd3c54820eb\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/pnggroup/libpng/commit/7ea9eea884a2328cc7fdcb3c0c00246a50d90667\", \"name\": \"https://github.com/pnggroup/libpng/commit/7ea9eea884a2328cc7fdcb3c0c00246a50d90667\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/pnggroup/libpng/commit/a3a21443ed12bfa1ef46fa0d4fb2b74a0fa34a25\", \"name\": \"https://github.com/pnggroup/libpng/commit/a3a21443ed12bfa1ef46fa0d4fb2b74a0fa34a25\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/pnggroup/libpng/commit/c1b0318b393c90679e6fa5bc1d329fd5d5012ec1\", \"name\": \"https://github.com/pnggroup/libpng/commit/c1b0318b393c90679e6fa5bc1d329fd5d5012ec1\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.2.1 through 1.6.55, `png_set_tRNS` and `png_set_PLTE` each alias a heap-allocated buffer between `png_struct` and `png_info`, sharing a single allocation across two structs with independent lifetimes. The `trans_alpha` aliasing has been present since at least libpng 1.0, and the `palette` aliasing since at least 1.2.1. Both affect all prior release lines `png_set_tRNS` sets `png_ptr-\u003etrans_alpha = info_ptr-\u003etrans_alpha` (256-byte buffer) and `png_set_PLTE` sets `info_ptr-\u003epalette = png_ptr-\u003epalette` (768-byte buffer). In both cases, calling `png_free_data` (with `PNG_FREE_TRNS` or `PNG_FREE_PLTE`) frees the buffer through `info_ptr` while the corresponding `png_ptr` pointer remains dangling. Subsequent row-transform functions dereference and, in some code paths, write to the freed memory. A second call to `png_set_tRNS` or `png_set_PLTE` has the same effect, because both functions call `png_free_data` internally before reallocating the `info_ptr` buffer. Version 1.6.56 fixes the issue.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416: Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-03-26T16:48:54.174Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-33416\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-01T03:55:17.603Z\", \"dateReserved\": \"2026-03-19T17:02:34.172Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-03-26T16:48:54.174Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

CERTFR-2026-AVI-0381

Vulnerability from certfr_avis

De multiples vulnérabilités ont été découvertes dans les produits Microsoft. Elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

Vendor	Product	Description
Microsoft	CBL Mariner	cbl2 plexus-utils 3.3.0-3 versions antérieures à 3.3.0-4
Microsoft	CBL Mariner	cbl2 kernel 5.15.200.1-1 versions antérieures à 5.15.202.1-1
Microsoft	Azure Linux	azl3 python-requests 2.31.0-3 versions antérieures à 2.31.0-4
Microsoft	CBL Mariner	cbl2 libpng 1.6.55-1 versions antérieures à 1.6.56-1

References

Title

Publication Time

Tags

Bulletin de sécurité Microsoft CVE-2026-23169	2026-03-20	vendor-advisory
Bulletin de sécurité Microsoft CVE-2026-33416	2026-03-29	vendor-advisory
Bulletin de sécurité Microsoft CVE-2025-67030	2026-03-29	vendor-advisory
Bulletin de sécurité Microsoft CVE-2026-25645	2026-03-29	vendor-advisory
Bulletin de sécurité Microsoft CVE-2026-33636	2026-03-29	vendor-advisory

Show details on source website

JSON

To clipboard

{
  "$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
  "affected_systems": [
    {
      "description": "cbl2 plexus-utils 3.3.0-3 versions ant\u00e9rieures \u00e0 3.3.0-4",
      "product": {
        "name": "CBL Mariner",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "cbl2 kernel 5.15.200.1-1 versions ant\u00e9rieures \u00e0 5.15.202.1-1",
      "product": {
        "name": "CBL Mariner",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "azl3 python-requests 2.31.0-3 versions ant\u00e9rieures \u00e0 2.31.0-4",
      "product": {
        "name": "Azure Linux",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "cbl2 libpng 1.6.55-1 versions ant\u00e9rieures \u00e0 1.6.56-1",
      "product": {
        "name": "CBL Mariner",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    }
  ],
  "affected_systems_content": "",
  "content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
  "cves": [
    {
      "name": "CVE-2026-25645",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-25645"
    },
    {
      "name": "CVE-2025-67030",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-67030"
    },
    {
      "name": "CVE-2026-23169",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-23169"
    },
    {
      "name": "CVE-2026-33636",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-33636"
    },
    {
      "name": "CVE-2026-33416",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-33416"
    }
  ],
  "initial_release_date": "2026-03-31T00:00:00",
  "last_revision_date": "2026-03-31T00:00:00",
  "links": [],
  "reference": "CERTFR-2026-AVI-0381",
  "revisions": [
    {
      "description": "Version initiale",
      "revision_date": "2026-03-31T00:00:00.000000"
    }
  ],
  "risks": [
    {
      "description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
    }
  ],
  "summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans les produits Microsoft. Elles permettent \u00e0 un attaquant de provoquer un probl\u00e8me de s\u00e9curit\u00e9 non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur.",
  "title": "Multiples vuln\u00e9rabilit\u00e9s dans les produits Microsoft",
  "vendor_advisories": [
    {
      "published_at": "2026-03-20",
      "title": "Bulletin de s\u00e9curit\u00e9 Microsoft CVE-2026-23169",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23169"
    },
    {
      "published_at": "2026-03-29",
      "title": "Bulletin de s\u00e9curit\u00e9 Microsoft CVE-2026-33416",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33416"
    },
    {
      "published_at": "2026-03-29",
      "title": "Bulletin de s\u00e9curit\u00e9 Microsoft CVE-2025-67030",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-67030"
    },
    {
      "published_at": "2026-03-29",
      "title": "Bulletin de s\u00e9curit\u00e9 Microsoft CVE-2026-25645",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-25645"
    },
    {
      "published_at": "2026-03-29",
      "title": "Bulletin de s\u00e9curit\u00e9 Microsoft CVE-2026-33636",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33636"
    }
  ]
}

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.

Action not permitted

CVE-2026-33416 (GCVE-0-2026-33416)

Vulnerability from cvelistv5

CERTFR-2026-AVI-0381

Vulnerability from certfr_avis

Solutions

Tags

Sightings

Nomenclature