Vulnerability-Lookup

UBUNTU-CVE-2026-66040 (CVE-2026-66040)

Vulnerability from osv_ubuntu – Published: 2026-07-24 20:18 – Updated: 2026-08-21 18:05 – Source website

Details

FFmpeg through 8.1.2, fixed in commit b506faf, contains a heap out-of-bounds write vulnerability in the native PNG and APNG encoders that allows remote attackers to corrupt heap memory by supplying a crafted PNG image with a malicious eXIf chunk. Attackers can craft an eXIf chunk where multiple IFD entries reference the same large value payload, causing canonical serialization to expand the output far beyond the undersized allocation estimated by add_exif_profile_size(), resulting in png_write_chunk() writing tens of thousands of bytes past the buffer boundary, leading to deterministic heap corruption, process crash, and potentially arbitrary code execution.

Severity

8.8 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

8.8 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

8.7 (High)


                    
                      CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-66040	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-66040	REPORT
	https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23786	REPORT
	https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/b506…	REPORT
	https://www.vulncheck.com/advisories/ffmpeg-heap-…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libav-tools",
            "binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
          },
          {
            "binary_name": "libavcodec-extra",
            "binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
          },
          {
            "binary_name": "libavcodec-extra-54",
            "binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
          },
          {
            "binary_name": "libavcodec54",
            "binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
          },
          {
            "binary_name": "libavdevice-extra-53",
            "binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
          },
          {
            "binary_name": "libavdevice53",
            "binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
          },
          {
            "binary_name": "libavfilter-extra-3",
            "binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
          },
          {
            "binary_name": "libavfilter3",
            "binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
          },
          {
            "binary_name": "libavformat-extra-54",
            "binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
          },
          {
            "binary_name": "libavformat54",
            "binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
          },
          {
            "binary_name": "libavresample1",
            "binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
          },
          {
            "binary_name": "libavutil-extra-52",
            "binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
          },
          {
            "binary_name": "libavutil52",
            "binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
          },
          {
            "binary_name": "libswscale-extra-2",
            "binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
          },
          {
            "binary_name": "libswscale2",
            "binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "libav",
        "purl": "pkg:deb/ubuntu/libav@6:9.20-0ubuntu0.14.04.1+esm1?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6:0.8.7-1ubuntu2",
        "6:9.10-1ubuntu1",
        "6:9.10-1ubuntu2",
        "6:9.10-1ubuntu5",
        "6:9.10-1ubuntu6",
        "6:9.10-1ubuntu7",
        "6:9.11-2ubuntu1",
        "6:9.11-2ubuntu2",
        "6:9.13-0ubuntu0.14.04.1",
        "6:9.14-0ubuntu0.14.04.1",
        "6:9.16-0ubuntu0.14.04.1",
        "6:9.18-0ubuntu0.14.04.1",
        "6:9.20-0ubuntu0.14.04.1",
        "6:9.20-0ubuntu0.14.04.1+esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "FFmpeg through 8.1.2, fixed in commit b506faf, contains a heap out-of-bounds write vulnerability in the native PNG and APNG encoders that allows remote attackers to corrupt heap memory by supplying a crafted PNG image with a malicious eXIf chunk. Attackers can craft an eXIf chunk where multiple IFD entries reference the same large value payload, causing canonical serialization to expand the output far beyond the undersized allocation estimated by add_exif_profile_size(), resulting in png_write_chunk() writing tens of thousands of bytes past the buffer boundary, leading to deterministic heap corruption, process crash, and potentially arbitrary code execution.",
  "id": "UBUNTU-CVE-2026-66040",
  "modified": "2026-08-21T18:05:41Z",
  "published": "2026-07-24T20:18:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-66040"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-66040"
    },
    {
      "type": "REPORT",
      "url": "https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23786"
    },
    {
      "type": "REPORT",
      "url": "https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/b506fafec9a19fcbc2be5271875fd4a63d6615bc"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/ffmpeg-heap-out-of-bounds-write-via-png-apng-exif-encoder"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-66040"
  ]
}

CVE-2026-66040 (GCVE-0-2026-66040)

Vulnerability from cvelistv5 – Published: 2026-07-24 19:46 – Updated: 2026-07-29 03:55 X_Open Source

Title

FFmpeg Heap Out-of-Bounds Write via PNG/APNG eXIf Encoder

Summary

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-28 00:00 UTC

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

VulnCheck mitre root

References

3 references

URL	Tags
https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23786	issue-tracking
https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/b506…	patch
https://www.vulncheck.com/advisories/ffmpeg-heap-…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
FFmpeg	FFmpeg	Affected: 0 , ≤ 8.1.2 (semver) Unaffected: b506fafec9a19fcbc2be5271875fd4a63d6615bc (git) cpe:2.3:a:ffmpeg:ffmpeg::::::::

Date Public

2026-07-21 00:00

Credits

Adrian Junge (vurlo)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-66040",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-28T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-29T03:55:38.351Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "affected",
          "product": "FFmpeg",
          "repo": "https://code.ffmpeg.org/FFmpeg/FFmpeg",
          "vendor": "FFmpeg",
          "versions": [
            {
              "lessThanOrEqual": "8.1.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "b506fafec9a19fcbc2be5271875fd4a63d6615bc",
              "versionType": "git"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "8.1.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Adrian Junge (vurlo)"
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        {
          "lang": "en",
          "value": "FFmpeg through 8.1.2, fixed in commit b506faf, contains a heap out-of-bounds write vulnerability in the native PNG and APNG encoders that allows remote attackers to corrupt heap memory by supplying a crafted PNG image with a malicious eXIf chunk. Attackers can craft an eXIf chunk where multiple IFD entries reference the same large value payload, causing canonical serialization to expand the output far beyond the undersized allocation estimated by add_exif_profile_size(), resulting in png_write_chunk() writing tens of thousands of bytes past the buffer boundary, leading to deterministic heap corruption, process crash, and potentially arbitrary code execution."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
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            "vulnAvailabilityImpact": "HIGH",
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            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
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            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
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          "scenarios": [
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      "references": [
        {
          "name": "Pull Request",
          "tags": [
            "issue-tracking"
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          "url": "https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23786"
        },
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          "name": "Patch Commit",
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          "url": "https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/b506fafec9a19fcbc2be5271875fd4a63d6615bc"
        },
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  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-66040",
    "datePublished": "2026-07-24T19:46:25.959Z",
    "dateReserved": "2026-07-23T20:45:17.817Z",
    "dateUpdated": "2026-07-29T03:55:38.351Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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UBUNTU-CVE-2026-66040 (CVE-2026-66040)

CVE-2026-66040 (GCVE-0-2026-66040)

Tags

Sightings

Nomenclature

Related by attack behaviour