CVE-2026-125205

CVSS 6.8 (medium) · published 2026-11-09

FFmpeg through 9.0.2 contains an unbounded memory allocation vulnerability in the av1_frame_merge bitstream filter that allows attackers to exhaust memory by never sending a temporal delimiter OBU. Attackers can supply a crafted .obu file opened by the AV1 OBU or Annex B demuxers, forcing unlimited OBU buffering per temporal unit and causing denial of service.

Weakness: CWE-770

Source: NVD CVE-2026-125205

References

• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25569
• https://github.com/FFmpeg/FFmpeg
• https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/bsf/av1_frame_merge.c#L97
• https://github.com/FFmpeg/FFmpeg/commit/c90bbc2036bac67e95777638bdc86157a775858a
• https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-memory-exhaustion-via-av1-frame-merge-bitstream-filter

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