Uncontrolled Resource Consumption in FFmpeg by JPEG XL Frame Header
CVE-2026-125264

6.8MEDIUM

Key Information:

Vendor

Ffmpeg

Status
Ffmpeg
Vendor
CVE Published:
9 November 2026

What is CVE-2026-125264?

FFmpeg versions up to 9.0.2 are susceptible to an uncontrolled resource consumption vulnerability within the parse_frame_header() function in libavcodec/jpegxl_parser.c. This issue arises when the parser fails to validate the Table of Contents (TOC) entry counts against the remaining input, permitting attackers to craft a malicious JPEG XL frame header. By supplying a permuted TOC and an excessively large toc_count, attackers can induce the parser to enter an infinite loop, leading to significant CPU exhaustion and affecting system performance.

Affected Version(s)

FFmpeg 0 <= 9.0.2

References

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25569
issue-tracking
https://github.com/FFmpeg/FFmpeg/commit/bc896c613ec0d4ad0...
patch
https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/j...
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
.