{"id":"CVE-2026-75143","title":"FFmpeg Heap Buffer Overflow via RIST Protocol Reader","summary":"FFmpeg before commit 1c10bcc contains a heap buffer overflow in the RIST protocol reader (libavformat/librist.c). librist_read() ignored its size argument and copied the full received payload length into the caller-provided destination b…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-122"],"vendor":"FFmpeg","product":"FFmpeg","affected":["FFmpeg < 1c10bcc2e17255dacb717a25ab3db142ce390602"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-08-20T00:00:00+00:00"},"published":"2026-08-19","updated":"2026-10-27","sourceUpdated":"2026-10-27T10:14:30.888Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-75143","references":[{"url":"https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24089","label":"Pull Request"},{"url":"https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/1c10bcc2e17255dacb717a25ab3db142ce390602","label":"Patch Commit"},{"url":"https://www.vulncheck.com/advisories/ffmpeg-heap-buffer-overflow-via-rist-protocol-reader"}],"tags":["cve.org"],"epss":0.00702,"epssPercentile":0.53064,"ingestedAt":"2026-10-27T16:11:59.274Z","slug":"CVE-2026-75143","body":"## Overview\n\nFFmpeg before commit 1c10bcc contains a heap buffer overflow in the RIST protocol reader (libavformat/librist.c). librist_read() ignored its size argument and copied the full received payload length into the caller-provided destination buffer, overflowing it when the payload exceeds the destination size. This is reachable via the async:rist:// URL scheme, where the async wrapper supplies a smaller buffer than the received payload. A remote RIST sender can trigger the overflow by sending a packet whose payload exceeds the caller buffer size.\n\n## Affected\n\n- `FFmpeg < 1c10bcc2e17255dacb717a25ab3db142ce390602`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}