CVE-2026-125205

medium

Description

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.

References

https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-memory-exhaustion-via-av1-frame-merge-bitstream-filter

https://github.com/FFmpeg/FFmpeg/commit/c90bbc2036bac67e95777638bdc86157a775858a

https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/bsf/av1_frame_merge.c#L97

https://github.com/FFmpeg/FFmpeg

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-120294

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25569

Details

Source: Mitre, NVD

Published: 2026-11-09

Updated: 2026-11-10

Risk Information

CVSS v2

Base Score: 4.9

Vector: CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:C

Severity: Medium

CVSS v3

Base Score: 5.5

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

Severity: Medium

CVSS v4

Base Score: 6.8

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Severity: Medium

EPSS

EPSS: 0.00165