Vulnerability in Ffmpeg
CVE-2026-125254
FFmpeg through 9.0.2 contains a division by zero vulnerability in the VVC decoder because ff_vvc_slice_rpl() fails to validate num_ref_idx_active against built reference list entries. Attackers can supply a crafted VVC bitstream whose excess reference indices yield a zero POC difference in ff_vvc_mv_scale(), crashing the decoding process.
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/commit/8732d7585cd8ab9d1dd9baeb4db5e93466c0efa7 (patch)
- github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/vvc/mvs.c (technical-description)
- github.com/FFmpeg/FFmpeg (product)
- www.vulncheck.com/advisories/ffmpeg-through-9.0.2-division-by-zero-via-vvc-ff-v… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-125254?
- CVE-2026-125254 is a medium-severity vulnerability in Ffmpeg, classified under Divide By Zero. CVSS score: 5.5/10. Published 2026-11-09.
- How severe is CVE-2026-125254?
- Medium severity. CVSS v3 base score is 5.5 out of 10.