Vulnerability in Ffmpeg
CVE-2026-125183
FFmpeg through 9.0.2 contains a denial of service vulnerability in pps_3d_extension() in libavcodec/hevc/ps.c that allows attackers to exhaust CPU through unbounded depth lookup table loops. Attackers can supply crafted HEVC files with repeated PPS NAL units that trigger hundreds of millions of bit skips, stalling decoders, parsers, and ffprobe.
Published .
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/25572 (issue-tracking)
- github.com/FFmpeg/FFmpeg (product)
- github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/hevc/ps.c (technical-description)
- Patch Commit (patch)
- VulnCheck Advisory: FFmpeg through 9.0.2 Denial of Service via HEVC PPS 3D Extension Parsing (third-party-advisory)
Frequently asked questions
- What is CVE-2026-125183?
- CVE-2026-125183 is a medium-severity vulnerability in Ffmpeg, classified under Excessive Iteration. CVSS score: 5.5/10. Published 2026-11-09.
- How severe is CVE-2026-125183?
- Medium severity. CVSS v3 base score is 5.5 out of 10.