{"id":"CVE-2026-125187","title":"FFmpeg through 9.0.2 TTA Encoder Reachable Assertion via tta_encode_frame()","summary":"FFmpeg through 9.0.2 contains a reachable assertion vulnerability in the TTA encoder's tta_encode_frame() in libavcodec/ttaenc.c, which never reserves output packet space for the 4-byte CRC. Attackers can supply audio whose sample values…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-617"],"vendor":"FFmpeg","product":"FFmpeg","affected":["FFmpeg <= 9.0.2"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-09T21:02:28.982674Z"},"published":"2026-11-09","updated":"2026-11-09","sourceUpdated":"2026-11-09T21:06:57.465Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-125187","references":[{"url":"https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25694"},{"url":"https://github.com/FFmpeg/FFmpeg/commit/29a629e788c4343ff2e923095b8f38769fe2e470","label":"Patch Commit"},{"url":"https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/ttaenc.c#L93"},{"url":"https://github.com/FFmpeg/FFmpeg"},{"url":"https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-tta-encoder-reachable-assertion-via-tta-encode-frame","label":"VulnCheck Advisory: FFmpeg through 9.0.2 TTA Encoder Reachable Assertion via tta_encode_frame()"}],"tags":["cve.org"],"ingestedAt":"2026-11-09T19:18:02.608Z","slug":"CVE-2026-125187","body":"## Overview\n\nFFmpeg through 9.0.2 contains a reachable assertion vulnerability in the TTA encoder's tta_encode_frame() in libavcodec/ttaenc.c, which never reserves output packet space for the 4-byte CRC. Attackers can supply audio whose sample values and length produce a small, poorly compressible final frame, triggering the av_assert0() in flush_put_bits() and aborting applications transcoding to TTA.\n\n## Affected\n\n- `FFmpeg <= 9.0.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}