{"id":"CVE-2026-75145","revision":"bd9f0b3488454f49adc5c77f28babbb9","records":[{"revision":"bd9f0b3488454f49adc5c77f28babbb9","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-75145","aliases":[],"title":"FFmpeg Integer Narrowing Conversion OOB Memory Access in AV1 RTP Packetizer","description":"FFmpeg before commit b4c199c contains an incorrect integer narrowing conversion in the AV1 RTP packetizer (libavformat/rtpenc_av1.c). The OBU size is cast to long before comparison against the remaining frame size. On targets where long is 32 bits, including 64-bit Windows, sufficiently large OBU size values are sign-flipped by the narrowing cast, producing a negative value that passes the payload size check. This allows an oversized OBU to bypass the safety bound on affected platforms, leading to out-of-bounds memory access when the oversized value is subsequently used as a copy length.","state":0,"publishedAt":"2026-08-19T16:27:33.12+00:00","modifiedAt":"2026-08-21T19:52:12.755+00:00","affected":[{"ecosystem":"Vendor product","name":"FFmpeg","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"FFmpeg\",\n                    \"product\": \"FFmpeg\",\n                    \"repo\": \"https://code.ffmpeg.org/FFmpeg/FFmpeg\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"lessThan\": \"b4c199c5906ff53368926c2a5839881f41957e7f\",\n                            \"versionType\": \"git\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:github/FFmpeg/FFmpeg\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N","score":5.8,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H","score":5.8,"severity":"MEDIUM"}],"references":["https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24090","https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/b4c199c5906ff53368926c2a5839881f41957e7f","https://www.vulncheck.com/advisories/ffmpeg-integer-narrowing-conversion-oob-memory-access-in-av1-rtp-packetizer"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-75145","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-75145","identifiers":["CVE-2026-75145"]},"retained":false,"historicalAffected":[]}],"coverage":[]}