{"id":"CVE-2026-125259","title":"FFmpeg through 9.0.2 Heap Buffer Overflow via ProRes prores_ks Encoder","summary":"FFmpeg through 9.0.2 contains an integer overflow vulnerability in ff_prores_kostya_encode_init() that miscalculates frame_size_upper_bound using 32-bit arithmetic for large frame dimensions. Attackers can supply a high-resolution video …","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-190"],"vendor":"FFmpeg","product":"FFmpeg","affected":["FFmpeg <= 9.0.2"],"published":"2026-11-09","updated":"2026-11-09","sourceUpdated":"2026-11-09T19:12:02.579Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-125259","references":[{"url":"https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25573"},{"url":"https://github.com/FFmpeg/FFmpeg/commit/439b452f9fe916a9f7d8788ab6afee8fac846b0b","label":"Patch Commit"},{"url":"https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/proresenc_kostya_common.c#L286"},{"url":"https://github.com/FFmpeg/FFmpeg"},{"url":"https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-heap-buffer-overflow-via-prores-prores-ks-encoder","label":"VulnCheck Advisory: FFmpeg through 9.0.2 Heap Buffer Overflow via ProRes prores_ks Encoder"}],"tags":["cve.org"],"ingestedAt":"2026-11-09T20:27:27.082Z","slug":"CVE-2026-125259","body":"## Overview\n\nFFmpeg through 9.0.2 contains an integer overflow vulnerability in ff_prores_kostya_encode_init() that miscalculates frame_size_upper_bound using 32-bit arithmetic for large frame dimensions. Attackers can supply a high-resolution video transcoded with the prores_ks encoder, causing encode_frame() to write slices past an undersized packet buffer and corrupt heap memory.\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":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}