CVE-2026-107676
FFmpeg through 9.0.2 Uninitialized Memory Disclosure via HDR10+ Metadata Serializer
- State
- Published
- Severity
- 4.8 Medium
- Published
- Oct 8, 2026
- Updated
- Oct 14, 2026
- Reserved
- Oct 8, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 4.8 Medium | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 3.3 Low | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N | VulnCheck |
Weaknesses
- CWE-908 Use of Uninitialized Resource
Affected Products
| Product | Versions |
|---|---|
FFmpegFFmpeg |
|
References
- https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24590patch
- https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/2c2f6e96e31795ae95a8f8323a493ffbc493111fpatch
- https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavutil/hdr_dynamic_metadata.c#L374-L385technical-description
- https://ffmpeg.org/product
- VulnCheck Advisory: FFmpeg through 9.0.2 Uninitialized Memory Disclosure via HDR10+ Metadata Serializerthird-party-advisory
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