Integer Overflow Vulnerability in FFmpeg's WavPack Encoding Function
CVE-2026-125234

6.8MEDIUM

Key Information:

Vendor

Ffmpeg

Status
Ffmpeg
Vendor
CVE Published:
9 November 2026

What is CVE-2026-125234?

An integer overflow vulnerability exists within the wavpack_encode_init() function in FFmpeg's libavcodec. This weakness allows an attacker to create a specially crafted audio file, such as a WAV file, that specifies an unreasonably high sample rate and a large channel count. When applications attempt to transcode these manipulated files into WavPack, they may become unresponsive due to an infinite loop triggered during block size computation. As a result, the transcoding process could hang, impacting application performance and usability.

Affected Version(s)

FFmpeg 0 <= 9.0.2

References

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25694
issue-tracking
https://github.com/FFmpeg/FFmpeg/commit/e621da8ecdbef8edb...
patch
https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/w...
technical-description

CVSS V4

Score:
6.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Joshua Rogers (AISLE Research)
Michael Niedermayer
.