FFmpeg 0.7.1 - 8.1.2 Out-of-Bounds Read via S/PDIF Muxer spdifenc.c

{
  "id": "3605d7b068f7611ffc2662ff1b2c49639bf4d1ff76d523ef173a36b109bca031",
  "url": "https://osv.dev/vulnerability/CVE-2026-64833",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "FFmpeg 0.7.1 - 8.1.2 Out-of-Bounds Read via S/PDIF Muxer spdifenc.c",
    "summary": "FFmpeg versions 0.7.1 through 8.1.2 contain an out-of-bounds read vulnerability in the S/PDIF muxer that allows attackers to access memory beyond buffer boundaries by supplying a crafted DTS stream with a core_size value larger than the actual packet length. Attackers can exploit the missing bounds check in the spdif_header_dts4 function by providing a malicious DTS-HD audio stream during S/PDIF re-muxing to trigger unauthorized memory reads beyond the packet buffer.",
    "evidence": "osv:CVE-2026-64833",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-64833",
      "aliases": [
        "CVE-2026-64833"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://code.ffmpeg.org/FFmpeg/FFmpeg",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6f80e2765492700622596af720534cef33dd31b4"
                },
                {
                  "last_affected": "6f80e2765492700622596af720534cef33dd31b4"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "6f80e2765492700622596af720534cef33dd31b4"
                      },
                      {
                        "last_affected": "6f80e2765492700622596af720534cef33dd31b4"
                      }
                    ],
                    "source": "AFFECTED_FIELD_GIT",
                    "strategy": "GitCommit"
                  }
                ]
              }
            },
            {
              "repo": "https://git.ffmpeg.org/ffmpeg.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b7b61ff6a31d4ffa1fb9a0ebeb1579d84c01c0b7"
                },
                {
                  "last_affected": "38b88335f99e76ed89ff3c93f877fdefce736c13"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.7.1"
                      },
                      {
                        "last_affected": "8.1.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            },
            {
              "repo": "https://github.com/ffmpeg/ffmpeg",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b7b61ff6a31d4ffa1fb9a0ebeb1579d84c01c0b7"
                },
                {
                  "last_affected": "38b88335f99e76ed89ff3c93f877fdefce736c13"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.7.1"
                      },
                      {
                        "last_affected": "8.1.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "6f80e2765492700622596af720534cef33dd31b4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64833.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.478291483Z",
      "provider": "osv",
      "references": [
        "https://code.ffmpeg.org/FFmpeg/FFmpeg",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64833.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64833",
        "https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-read-via-s-pdif-muxer-spdifenc-c",
        "https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23661",
        "https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/6f80e2765492700622596af720534cef33dd31b4"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-125"
        ],
        "cna_assigner": "VulnCheck",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0.7.1"
                  },
                  {
                    "last_affected": "8.1.2"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64833.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-64833",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505901,
  "published_at": "2026-07-22T17:03:20.875+00:00"
}