Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/b4c199c5906ff53368926c2a5839881f419
- https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24090
- https://www.vulncheck.com/advisories/ffmpeg-integer-narrowing-conversion-oob-mem
FAQ
What is CVE-2026-75145?
CVE-2026-75145 is a vulnerability with a CVSS score of 5.8 (MEDIUM). 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 remaini...
How severe is CVE-2026-75145?
CVE-2026-75145 has been rated MEDIUM with a CVSS base score of 5.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-75145?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.