FFmpeg through 9.0.2 Memory Leak in libxevd EVC Decoder Wrapper

Advisories

FFmpeg through 9.0.2 Memory Leak in libxevd EVC Decoder Wrapper

Severity: medium
Date: 11/9/2026
Affecting: FFmpeg >= 7.0, <= 9.0.2
CVE: CVE-2026-125173
CWE: CWE-401 Missing Release of Memory after Effective Lifetime
CVSS: 6.8
CVSS V4 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
References: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25416
Patch Commit
https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/libxevd.c#L341
https://github.com/FFmpeg/FFmpeg
Credit: Joshua Rogers (AISLE Research), Michael Niedermayer
Description: FFmpeg through 9.0.2 contains a memory leak vulnerability in libxevd_receive_frame() in libavcodec/libxevd.c that fails to free pkt_au when an access unit produces no picture. Attackers can supply a crafted EVC stream with many access units containing only parameter sets or non-frame NAL units to exhaust memory in the decoding application.

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