Vulnerability in Ffmpeg
CVE-2026-125206
FFmpeg through 9.0.2 contains an out-of-bounds read vulnerability in the prores_ks encoder's get_alpha_data() that reads before the blocks buffer for interlaced frames with odd heights. Attackers can supply video with alpha and odd height encoded to interlaced ProRes 4444, causing out-of-bounds memory to be encoded into the output alpha plane.
Published .
CVSS v3 metric
CVSS v3 base score 2.5 (Low). Vector: CVSS:3.1/AV:L/AC:H/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/24490 (issue-tracking)
- github.com/FFmpeg/FFmpeg (product)
- github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/proresenc_kostya.c (technical-description)
- github.com/FFmpeg/FFmpeg/commit/9edd06f8612c242b83bf9e3d14aa85180015a211 (patch)
- www.vulncheck.com/advisories/ffmpeg-through-9.0.2-out-of-bounds-read-via-prores… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-125206?
- CVE-2026-125206 is a low-severity vulnerability in Ffmpeg, classified under Buffer Under-read. CVSS score: 2.5/10. Published 2026-11-09.
- How severe is CVE-2026-125206?
- Low severity. CVSS v3 base score is 2.5 out of 10.