CVE-2026-107676 FFmpeg through 9.0.2 Uninitialized Memory Disclosure via HDR10+ Metadata Serializer

Medium 4.8 Published 8 Oct 2026 Updated 14 Oct 2026

Attackers can leak process memory into output files by crafting specific metadata in media files processed by FFmpeg.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2026-107676?

CVE-2026-107676 is a medium-severity vulnerability in Ffmpeg Ffmpeg, published on 8 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-908

Which versions are affected by CVE-2026-107676?

It affects 1 product.

Products include Ffmpeg Ffmpeg.

How do I fix CVE-2026-107676?

Apply the vendor's patch.

Is CVE-2026-107676 being exploited?

There is no known exploitation of CVE-2026-107676 in the wild and no public exploit code.

All Ffmpeg Ffmpeg vulnerabilities

Sources

Also known as DEBIAN-CVE-2026-107676, ECHO-568a-c122-8733, GHSA-77pg-jq65-mg2f, UBUNTU-CVE-2026-107676.