CVE-2026-75147 FFmpeg Out-of-Bounds Read in AV1 RTP Packetizer via rtpenc_av1.c
A crafted AV1 packet triggers an out-of-bounds read in FFmpeg's RTP packetizer, potentially causing crashes or leaking memory contents.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-75147?
CVE-2026-75147 is a medium-severity memory corruption vulnerability in FFmpeg, published on 19 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-125
Which versions are affected by CVE-2026-75147?
How do I fix CVE-2026-75147?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-75147 being exploited?
There is no known exploitation of CVE-2026-75147 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-75147, ECHO-2861-d781-30a1, GHSA-63qj-83cj-jp3m, UBUNTU-CVE-2026-75147.