{"id":"CVE-2026-125171","title":"FFmpeg through 9.0.2 Out-of-Bounds Read in Musepack SV7 Decoder via mpc7.c","summary":"FFmpeg through 9.0.2 contains an out-of-bounds read vulnerability in the Musepack SV7 decoder because mpc7_decode_init() does not validate lastframelen against MPC_FRAME_SIZE. Attackers can supply a crafted Musepack SV7 file declaring an…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H","cvssSource":"cna","cwe":["CWE-125"],"vendor":"FFmpeg","product":"FFmpeg","affected":["FFmpeg <= 9.0.2"],"published":"2026-11-09","updated":"2026-11-09","sourceUpdated":"2026-11-09T19:10:59.844Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-125171","references":[{"url":"https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25074"},{"url":"https://github.com/FFmpeg/FFmpeg/commit/5d59b7c45d7142bddd13ddc8891e72c5c7dc991b","label":"Patch Commit"},{"url":"https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/mpc7.c#L281"},{"url":"https://github.com/FFmpeg/FFmpeg"},{"url":"https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-out-of-bounds-read-in-musepack-sv7-decoder-via-mpc7-c","label":"VulnCheck Advisory: FFmpeg through 9.0.2 Out-of-Bounds Read in Musepack SV7 Decoder via mpc7.c"}],"tags":["cve.org"],"ingestedAt":"2026-11-09T19:18:02.621Z","slug":"CVE-2026-125171","body":"## Overview\n\nFFmpeg through 9.0.2 contains an out-of-bounds read vulnerability in the Musepack SV7 decoder because mpc7_decode_init() does not validate lastframelen against MPC_FRAME_SIZE. Attackers can supply a crafted Musepack SV7 file declaring an oversized final frame, causing consumers of decoded frames to read past the audio buffer, leading to crashes or heap memory disclosure.\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":34,"depthScoreParts":{"impact":33.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}