CVE-2026-125205

MEDIUM 5.5

FFmpeg through 9.0.2 Memory Exhaustion via av1_frame_merge Bitstream Filter

CVSS Score

5.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-770
Vendor	ffmpeg
Product	ffmpeg
Published	Nov 9, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

FFmpeg / FFmpeg

0 ≤ 9.0.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Joshua Rogers (AISLE Research) Michael Niedermayer