Vulnerability in Ffmpeg
CVE-2026-125263
FFmpeg 9.0 through 9.0.2 built with liblcevc_dec fails to validate LCEVC enhanced output dimensions against max_pixels in libavcodec/decode.c before frame allocation. Attackers can supply crafted H.264, HEVC or VVC streams declaring huge LCEVC resolutions to force oversized get_buffer2() allocations and exhaust 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/25408 (issue-tracking)
- github.com/FFmpeg/FFmpeg/commit/60b286521b46caa09792af04c6a4e3437aac8293 (patch)
- github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/decode.c (technical-description)
- github.com/FFmpeg/FFmpeg (product)
- www.vulncheck.com/advisories/ffmpeg-9.0-through-9.0.2-memory-exhaustion-via-lce… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-125263?
- CVE-2026-125263 is a medium-severity vulnerability in Ffmpeg, classified under CWE-789. CVSS score: 4.7/10. Published 2026-11-09.
- How severe is CVE-2026-125263?
- Medium severity. CVSS v3 base score is 4.7 out of 10.