Vulnerability in Ffmpeg
CVE-2026-125195
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.
Published .
CVSS v3 metric
CVSS v3 base score 2.5 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N.
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/25694 (issue-tracking)
- github.com/FFmpeg/FFmpeg (product)
- github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/adpcmenc.c (technical-description)
- github.com/FFmpeg/FFmpeg/commit/fb13409aaffc151f602ad357db46052e98ea46e8 (patch)
- www.vulncheck.com/advisories/ffmpeg-through-9.0.2-uninitialized-memory-disclosu… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-125195?
- CVE-2026-125195 is a low-severity vulnerability in Ffmpeg, classified under Use of Uninitialized Resource. CVSS score: 2.5/10. Published 2026-11-09.
- How severe is CVE-2026-125195?
- Low severity. CVSS v3 base score is 2.5 out of 10.