CVE-2026-125264 PUBLISHED

FFmpeg through 9.0.2 contains an uncontrolled resource consumption vulnerability in parse_frame_header() in libavcodec/jpegxl_parser.c that fails to validate TOC entry counts against remaining input. Attackers can supply a crafted JPEG XL frame header with a permuted TOC and huge toc_count, making the parser loop excessively and exhaust CPU.

• Joshua Rogers (AISLE Research) finder
• Michael Niedermayer remediation developer

• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25569
• Patch Commit
• https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/jpegxl_parser.c#L1343
• https://github.com/FFmpeg/FFmpeg
• VulnCheck Advisory: FFmpeg through 9.0.2 CPU Exhaustion via JPEG XL Parser TOC Count

• Unchecked Input for Loop Condition CWE