{"id":"CVE-2026-65704","state":"PUBLISHED","title":"FFmpeg 8.1.2 Out-of-Bounds Write via TY Demuxer and Shorten Decoder","description":"FFmpeg through 8.1.2 contains an out-of-bounds write vulnerability that allows attackers to cause heap corruption by supplying a crafted ffconcat file processed with the -safe 0 flag. The TY demuxer's demux_audio() function decrements packet size without bounds checking, producing a negative size value that is passed to memcpy() in shorten_decode_frame(), where conversion to size_t wraps the value to near SIZE_MAX and triggers reads beyond the source allocation and writes far beyond the Shorten decoder's bitstream buffer.","publishedAt":"2026-07-23T18:55:41.842Z","updatedAt":"2026-07-28T01:06:12.410Z","severity":{"score":7.3,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["FFmpeg FFmpeg"],"affected":[{"vendor":"FFmpeg","product":"FFmpeg","defaultStatus":"affected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"8.1.2","versionType":"custom"},{"version":"de771bd52774a52d45b0e2c82e56995a1ef40df7","status":"unaffected","versionType":"git"}],"repo":"https://code.ffmpeg.org/FFmpeg/FFmpeg"}],"references":["https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23767","https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/de771bd52774a52d45b0e2c82e56995a1ef40df7","https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-write-via-ty-demuxer-and-shorten-decoder"],"weaknesses":["CWE-787","CWE-191"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/65xxx/CVE-2026-65704.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-65704","state":"PUBLISHED","datePublished":"2026-07-23T18:55:41.842Z","dateUpdated":"2026-07-28T01:06:12.410Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-07-22T20:26:09.981Z"},"containers":{"cna":{"title":"FFmpeg 8.1.2 Out-of-Bounds Write via TY Demuxer and Shorten Decoder","descriptions":[{"lang":"en","value":"FFmpeg through 8.1.2 contains an out-of-bounds write vulnerability that allows attackers to cause heap corruption by supplying a crafted ffconcat file processed with the -safe 0 flag. 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