{"id":"CVE-2026-75141","title":"FFmpeg Heap Buffer Overflow in hvcC Box Writer via HEVC Muxing","summary":"FFmpeg before commit acf5d7c contains a heap buffer overflow in the hvcC box writer. When writing an HEVC configuration record with more NAL units of a single type than the count field can represent, the NAL unit count overflows, causing…","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-122"],"vendor":"FFmpeg","product":"FFmpeg","affected":["FFmpeg < acf5d7cdc1f9ae8752c23e1ea8d7f355ed780781"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-08-20T00:00:00+00:00"},"published":"2026-08-19","updated":"2026-10-27","sourceUpdated":"2026-10-27T10:14:29.483Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-75141","references":[{"url":"https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24088","label":"Pull Request"},{"url":"https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/acf5d7cdc1f9ae8752c23e1ea8d7f355ed780781","label":"Patch Commit"},{"url":"https://www.vulncheck.com/advisories/ffmpeg-heap-buffer-overflow-in-hvcc-box-writer-via-hevc-muxing"}],"tags":["cve.org"],"epss":0.00199,"epssPercentile":0.09653,"ingestedAt":"2026-10-27T16:11:59.273Z","slug":"CVE-2026-75141","body":"## Overview\n\nFFmpeg before commit acf5d7c contains a heap buffer overflow in the hvcC box writer. When writing an HEVC configuration record with more NAL units of a single type than the count field can represent, the NAL unit count overflows, causing a heap buffer overflow. A crafted HEVC input file triggers the overflow during muxing.\n\n## Affected\n\n- `FFmpeg < acf5d7cdc1f9ae8752c23e1ea8d7f355ed780781`\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":[]}