CVE-2026-125171 FFmpeg through 9.0.2 Out-of-Bounds Read in Musepack SV7 Decoder via mpc7.c

Medium 6.9 Published 9 Nov 2026 Updated 10 Nov 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-125171?

CVE-2026-125171 is a medium-severity vulnerability in FFmpeg, published on 9 Nov 2026.

Official description

FFmpeg through 9.0.2 contains an out-of-bounds read vulnerability in the Musepack SV7 decoder because mpc7_decode_init() does not validate lastframelen against MPC_FRAME_SIZE. Attackers can supply a crafted Musepack SV7 file declaring an oversized final frame, causing consumers of decoded frames to read past the audio buffer, leading to crashes or heap memory disclosure.

Weakness: CWE-125

Which versions are affected by CVE-2026-125171?

How do I fix CVE-2026-125171?

No fix has been published for CVE-2026-125171 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-125171 being exploited?

There is no known exploitation of CVE-2026-125171 in the wild and no public exploit code.

Sources

Also known as GHSA-232q-ggmr-68x2, UBUNTU-CVE-2026-125171.