CVE-2026-107676CWE-908

CVE-2026-107676

Low · published October 8, 2026

CVSS v3.1
3.3
EPSS
0%
Percentile
3.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
3.3 · LOW
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CVSS v4.0
4.8 · 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
EPSS
0.00144 · 3.4th percentile
Weakness
CWE-908 · Use of Uninitialized Resource
Published
2026-10-08T20:17Z
Affected products (1)
ProductVersionsFixed in
ffmpeg/ffmpeg≤ 9.0.2—
References (5)
https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/2c2f6e96e31795ae95a8f8323a493ffbc493111f · [email protected]https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24590 · [email protected]https://ffmpeg.org/ · [email protected]https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavutil/hdr_dynamic_metadata.c#L374-L385 · [email protected]https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-uninitialized-memory-disclosure-via-hdr10-metadata-serializer · [email protected]
EPSS history
Timeline
  • 10 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 08 OCT 15:28Z
    FFmpeg through 9.0.2 Uninitialized Memory Disclosure via HDR10+ Metadata Serializer
    cvelistv5
  • 08 OCT 15:28Z
    FFmpeg through 9.0.2 Uninitialized Memory Disclosure via HDR10+ Metadata Serializer
    cvelistv5