FFmpeg through 9.0.2 Uninitialized Memory Disclosure via HDR10+ Metadata Serializer

{
  "id": "9af11671f88a4dc78b08a24263ec349714efaa829b4a4323ff799d6e0f878735",
  "url": "https://osv.dev/vulnerability/CVE-2026-107676",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "FFmpeg through 9.0.2 Uninitialized Memory Disclosure via HDR10+ Metadata Serializer",
    "summary": "FFmpeg through 9.0.2 contains an uninitialized memory disclosure vulnerability in av_dynamic_hdr_plus_to_t35() that leaves up to three payload bytes uninitialized when tone_mapping_flag is 0. Attackers can supply crafted Matroska T.35 BlockAdditional or HEVC/AV1 SEI metadata so that remuxing or transcoding writes leaked process memory into output files.",
    "evidence": "osv:CVE-2026-107676",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-107676",
      "aliases": [
        "CVE-2026-107676"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.ffmpeg.org/ffmpeg.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "946fcce07b6dcd0331c8cc609192aeff5e1924f8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "9.0.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            },
            {
              "repo": "https://github.com/ffmpeg/ffmpeg",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "946fcce07b6dcd0331c8cc609192aeff5e1924f8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "9.0.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "9.0.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "n9.0.2",
            "n9.0.1",
            "n9.0",
            "n8.2-dev",
            "n8.1-dev",
            "n7.2-dev",
            "n7.1-dev",
            "n6.2-dev",
            "n6.1-dev",
            "n5.2-dev",
            "n5.1-dev",
            "n4.5-dev",
            "n4.4-dev",
            "n4.3-dev",
            "n4.2-dev",
            "n4.1-dev",
            "n3.5-dev",
            "n3.4-dev",
            "n3.3-dev",
            "n3.2-dev",
            "n3.1-dev",
            "n2.9-dev",
            "n2.8-dev",
            "n2.7-dev",
            "n2.6-dev",
            "n2.5-dev",
            "n2.4-dev",
            "n2.3-dev",
            "n2.2-dev",
            "n2.0",
            "n2.1-dev",
            "n1.3-dev",
            "n1.2-dev",
            "n1.1-dev",
            "n0.12-dev",
            "n0.11-dev",
            "n0.8",
            "N"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107676.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.541323125Z",
      "provider": "osv",
      "references": [
        "https://code.ffmpeg.org/FFmpeg/FFmpeg",
        "https://ffmpeg.org/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107676.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-107676",
        "https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-uninitialized-memory-disclosure-via-hdr10-metadata-serializer",
        "https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/2c2f6e96e31795ae95a8f8323a493ffbc493111f",
        "https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24590",
        "https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavutil/hdr_dynamic_metadata.c#L374-L385"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-908"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107676.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-107676",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 509223,
  "published_at": "2026-10-08T15:28:41.795+00:00"
}