CVE-2026-125195 FFmpeg through 9.0.2 Uninitialized Memory Disclosure via ADPCM_MS Trellis Encoding
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-125195?
CVE-2026-125195 is a low-severity vulnerability in FFmpeg, published on 9 Nov 2026.
Official description
FFmpeg through 9.0.2 contains an uninitialized memory disclosure vulnerability in adpcm_encode_frame() in libavcodec/adpcmenc.c that leaks heap bytes when encoding mono ADPCM_MS audio with trellis enabled. Attackers submitting audio to a service using this encoding receive output packets where about half of each block contains stale heap memory from the encoding process.
Weakness: CWE-908
Which versions are affected by CVE-2026-125195?
How do I fix CVE-2026-125195?
No fix has been published for CVE-2026-125195 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-125195 being exploited?
There is no known exploitation of CVE-2026-125195 in the wild and no public exploit code.
Sources
Also known as GHSA-j4g2-3pwm-jx97, UBUNTU-CVE-2026-125195.