What is CVE-2026-125173?

CVE-2026-125173 is a medium-severity vulnerability in Ffmpeg, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 5.5/10. Published 2026-11-09.

How severe is CVE-2026-125173?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Ffmpeg

CVE-2026-125173

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.

Published 2026-11-09.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Ffmpeg

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

References

code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25416 (issue-tracking)
github.com/FFmpeg/FFmpeg (product)
github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/libxevd.c (technical-description)
Patch Commit (patch)
VulnCheck Advisory: FFmpeg through 9.0.2 Memory Leak in libxevd EVC Decoder Wrapper (third-party-advisory)

Frequently asked questions

What is CVE-2026-125173?: CVE-2026-125173 is a medium-severity vulnerability in Ffmpeg, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 5.5/10. Published 2026-11-09.
How severe is CVE-2026-125173?: Medium severity. CVSS v3 base score is 5.5 out of 10.