Vulnerability Description
FFmpeg before commit 983dae9 contains an out-of-bounds read in the AV1 RTP packetizer (libavformat/rtpenc_av1.c). The keyframe detection loop that searches for a sequence header OBU advanced its pointer and remaining-size counter by the encoded header length plus the OBU payload size without first bounding the OBU size against the remaining data. A crafted OBU size causes the remaining-size counter to wrap to a positive value, causing the next loop iteration to dereference a pointer beyond the end of the packet buffer. A crafted AV1 input packet muxed to RTP triggers the out-of-bounds read.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/983dae9c19f46c87d597598c0fd2f2fcee0
- https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24096
- https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-read-in-av1-rtp-packet
FAQ
What is CVE-2026-75147?
CVE-2026-75147 is a vulnerability with a CVSS score of 7.1 (HIGH). FFmpeg before commit 983dae9 contains an out-of-bounds read in the AV1 RTP packetizer (libavformat/rtpenc_av1.c). The keyframe detection loop that searches for a sequence header OBU advanced its point...
How severe is CVE-2026-75147?
CVE-2026-75147 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-75147?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.