Out-of-bounds Read in Ffmpeg
CVE-2026-125182
FFmpeg through 9.0.2 contains an out-of-bounds read vulnerability in the Cook decoder joint_decode() function because cook_decode_init() does not check js_subband_start against subbands. Attackers can supply a crafted RealMedia file whose extradata causes reads past decode_buffer_0, leaking pointers and decoder state into decoded audio to help defeat ASLR.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.
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/24763 (issue-tracking)
- github.com/FFmpeg/FFmpeg (product)
- github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/cook.c (technical-description)
- github.com/FFmpeg/FFmpeg/commit/7145d13201c9f9c5253f40295714faa4f4ada1a0 (patch)
- www.vulncheck.com/advisories/ffmpeg-through-9.0.2-out-of-bounds-read-via-cook-d… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-125182?
- CVE-2026-125182 is a low-severity vulnerability in Ffmpeg, classified under Out-of-bounds Read. CVSS score: 3.3/10. Published 2026-11-09.
- How severe is CVE-2026-125182?
- Low severity. CVSS v3 base score is 3.3 out of 10.