Vulnerability in Ffmpeg
CVE-2026-125066
FFmpeg through 9.0.2 contains a NULL pointer dereference vulnerability in the Cirrus Logic AccuPak (CLJR) decoder in libavcodec/cljrdec.c because decode_frame() ignores init_get_bits() failure. Attackers can supply a crafted AVI file with a 2^28-byte CLJR frame that overflows the bit count, causing reads from a NULL buffer and crashing the process.
Published · last modified .
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
Weakness classification (CWE)
References
- code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25704 (issue-tracking)
- github.com/FFmpeg/FFmpeg (product)
- github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/cljrdec.c (technical-description)
- github.com/FFmpeg/FFmpeg/commit/d40c1b12811814fc6c2d0816527b003d8510ea06 (patch)
- www.vulncheck.com/advisories/ffmpeg-through-9.0.2-null-pointer-dereference-in-c… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-125066?
- CVE-2026-125066 is a medium-severity vulnerability in Ffmpeg, classified under CWE-252. CVSS score: 5.5/10. Published 2026-11-09.
- How severe is CVE-2026-125066?
- Medium severity. CVSS v3 base score is 5.5 out of 10.