Buffer overflow in Ffmpeg
CVE-2026-125181
FFmpeg through 9.0.2 contains an out-of-bounds write vulnerability in flic_decode_frame_15_16BPP() in libavcodec/flicvideo.c that allows attackers to corrupt heap memory on big-endian builds. Attackers can supply a crafted 15/16 bpp FLIC/FLX file with an FLI_BRUN chunk whose non-terminating byte-swap loop writes packet-derived data past the frame buffer, crashing the process.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 7.0 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/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/24901 (issue-tracking)
- github.com/FFmpeg/FFmpeg (product)
- github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/flicvideo.c (technical-description)
- github.com/FFmpeg/FFmpeg/commit/c0d308a9a616f4abcc4e0a4d86f7de92ecdef9f6 (patch)
- github.com/FFmpeg/FFmpeg/commit/eb47d7bb6cf13042c6ab14e22fc0c0c3a6e51e12 (patch)
- github.com/FFmpeg/FFmpeg/commit/ee30fb98c0d4e97abbd5e371d2a3a926e92bec70 (patch)
- www.vulncheck.com/advisories/ffmpeg-through-9.0.2-flic-decoder-out-of-bounds-wr… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-125181?
- CVE-2026-125181 is a high-severity vulnerability in Ffmpeg, classified under Out-of-bounds Write. CVSS score: 7.0/10. Published 2026-11-09.
- How severe is CVE-2026-125181?
- High severity. CVSS v3 base score is 7.0 out of 10.