CVE-2026-125251

Description

FFmpeg through 9.0.2 contains an integer overflow vulnerability in the VVC decoder alloc_frame() function in libavcodec/vvc/refs.c that undersizes the reference picture list allocation on 32-bit builds. Attackers can supply a crafted VVC (H.266) file with a very large number of NAL units per access unit to trigger heap out-of-bounds writes and corrupt memory.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

References

• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25572 ↗
• https://github.com/FFmpeg/FFmpeg/commit/053660fdb0d2403b838690689c47ad7685c3b10b ↗
• https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/vvc/refs.c#L148 ↗
• https://github.com/FFmpeg/FFmpeg ↗
• https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-vvc-decoder-heap-out-of-bounds-write-via-refs-c ↗