CVE-2026-125268 FFmpeg through 9.0.2 Uninitialized Heap Memory Disclosure in CFHD Decoder

Medium 4.8 Published 9 Nov 2026 Updated 10 Nov 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-125268?

CVE-2026-125268 is a medium-severity vulnerability in FFmpeg, published on 9 Nov 2026.

Official description

FFmpeg through 9.0.2 contains an uninitialized memory disclosure vulnerability in the CineForm HD decoder that allows attackers to leak heap memory via unzeroed idwt_tmp buffers in libavcodec/cfhd.c. Attackers can supply a crafted CFHD file with an ImageHeight tag exceeding coded band heights, causing uninitialized heap bytes to be filtered into decoded video output.

Weakness: CWE-908

Which versions are affected by CVE-2026-125268?

How do I fix CVE-2026-125268?

No fix has been published for CVE-2026-125268 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-125268 being exploited?

There is no known exploitation of CVE-2026-125268 in the wild and no public exploit code.

Sources

Also known as GHSA-j96v-29vh-9jrj, UBUNTU-CVE-2026-125268.