CVE-2026-107676

Low

Description

FFmpeg through 9.0.2 contains an uninitialized memory disclosure vulnerability in av_dynamic_hdr_plus_to_t35() that leaves up to three payload bytes uninitialized when tone_mapping_flag is 0. Attackers can supply crafted Matroska T.35 BlockAdditional or HEVC/AV1 SEI metadata so that remuxing or transcoding writes leaked process memory into output files.

SeverityLow

CVSS3.3

Exploit probability—

ProductFfmpeg

PublishedOct 8, 2026

First seenOct 8, 2026

Weakness typeCWE-908CWE-908

How to fix

Patches

code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24590
code.ffmpeg.org/FFmpeg/FFmpeg/commit/2c2f6e96e31795ae95a8f8323a493ffbc493111f

Affected products

Product	Affected versions	Fixed in
ffmpeg ffmpeg	v ≤ 9.0.2	—

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