NULL Pointer Dereference Vulnerability in FFmpeg by FFmpeg Inc.
CVE-2026-125231

6.8MEDIUM

Key Information:

Vendor

Ffmpeg

Status
Ffmpeg
Vendor
CVE Published:
9 November 2026

What is CVE-2026-125231?

FFmpeg versions 4.4 through 9.0.2 are affected by a vulnerability in the adx_decode_header function, where the channel layout is updated without validating the sample rate. This can allow attackers to provide specially crafted ADX/AAX streams with invalid sample rates, resulting in a NULL pointer dereference that may crash the application. This security issue highlights the need for validating input data to prevent crashes and potential exploitation.

Affected Version(s)

FFmpeg 4.4 <= 9.0.2

References

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25703
issue-tracking
https://github.com/FFmpeg/FFmpeg/commit/515dcad73d7771150...
patch
https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/a...
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
.