Vulnerability in Ffmpeg
CVE-2026-125252
FFmpeg through 9.0.2 contains a memory leak vulnerability in libavcodec/vaapi_decode.c that allows attackers to exhaust memory by supplying streams with slice parse errors. Attackers can craft H.264 or other VAAPI-decoded video where later slices fail to parse on every frame, continuously leaking VA parameter and slice buffers plus driver and heap memory.
Published .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/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
Weakness classification (CWE)
References
- code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25231 (issue-tracking)
- github.com/FFmpeg/FFmpeg/commit/4221a63ce869ade862557ca64693bf77f5032971 (patch)
- github.com/FFmpeg/FFmpeg/commit/838c660bb3cd66ba74981b453c14c79214f6ef92 (patch)
- github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/vaapi_decode.c (technical-description)
- github.com/FFmpeg/FFmpeg (product)
- www.vulncheck.com/advisories/ffmpeg-through-9.0.2-vaapi-memory-leak-via-abandon… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-125252?
- CVE-2026-125252 is a medium-severity vulnerability in Ffmpeg, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 4.7/10. Published 2026-11-09.
- How severe is CVE-2026-125252?
- Medium severity. CVSS v3 base score is 4.7 out of 10.