CVE-2026-125220

MEDIUM 5.5

FFmpeg through 9.0.2 Mimic Decoder Deadlock via Frame Threading Failure

CVSS Score

5.5

EPSS Score

0.0%

EPSS Percentile

0th

FFmpeg through 9.0.2 contains a deadlock vulnerability in mimic_decode_frame() in libavcodec/mimic.c that fails to report frame progress when init_get_bits8() fails. Attackers can supply a crafted file with an oversized Mimic intra frame followed by inter frames to hang frame-threaded decoding indefinitely.

CWE	CWE-833
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/25718 github.com: https://github.com/FFmpeg/FFmpeg/commit/db77b0b8318ddb38b5a3227724da088a325a4308 github.com: https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/mimic.c#L403 github.com: https://github.com/FFmpeg/FFmpeg vulncheck.com: https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-mimic-decoder-deadlock-via-frame-threading-failure

Credits

Joshua Rogers (AISLE Research) Michael Niedermayer