CVE-2026-125181 FFmpeg through 9.0.2 FLIC Decoder Out-of-Bounds Write via FLI_BRUN Byte Swap

High 7.3 Published 9 Nov 2026 Updated 9 Nov 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-125181?

CVE-2026-125181 is a high-severity vulnerability in FFmpeg, published on 9 Nov 2026.

Official description

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.

Weakness: CWE-787

Which versions are affected by CVE-2026-125181?

How do I fix CVE-2026-125181?

No fix has been published for CVE-2026-125181 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-125181 being exploited?

There is no known exploitation of CVE-2026-125181 in the wild and no public exploit code.

Sources

Also known as GHSA-2c7g-m5pp-fggr, UBUNTU-CVE-2026-125181.