{"id":"CVE-2026-75143","aliases":[],"title":"FFmpeg Heap Buffer Overflow via RIST Protocol Reader","titleSource":"VulnCheck","descriptionSource":"VulnCheck","products":[{"vendor":"FFmpeg","name":"FFmpeg","platforms":[],"versions":[{"version":"0","status":"affected","lessThan":"1c10bcc2e17255dacb717a25ab3db142ce390602","versionType":"git"}],"defaultStatus":"unaffected","source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-75143"}],"remediation":[],"description":"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 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size.","severity":"critical","score":9.3,"published":"2026-08-19T16:26:12.445Z","modified":"2026-10-27T10:14:30.888Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24089","https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/1c10bcc2e17255dacb717a25ab3db142ce390602","https://www.vulncheck.com/advisories/ffmpeg-heap-buffer-overflow-via-rist-protocol-reader"],"sources":[{"name":"CVE","id":"CVE-2026-75143","modified":"2026-10-27T10:14:30.888Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-75143"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":9.3},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8}],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T16:50:32.247Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}