CVE-2026-120247

Medium

Description

FFmpeg 2.3 through 9.0.2 contains a use of uninitialized resource vulnerability in the Huffyuv decoder that allows attackers to leak heap memory into decoded pixels via short packed-BGR bitstreams. Attackers can craft a Huffyuv BGR24/BGRA video whose entropy data ends early, causing decode_slice() to add uninitialized s->temp[0] bytes into output frames, exposing heap contents.

SeverityMedium

CVSS5.5

Exploit probability—

ProductFFmpeg

PublishedNov 1, 2026

First seenNov 4, 2026

Weakness typeCWE-908CWE-908

How to fix

Patches

github.com/FFmpeg/FFmpeg/commit/7c73707355708c846f718cca90096bc1a33c8989

Affected products

Product	Affected versions	Fixed in
FFmpeg FFmpeg	2.3 ≤ v ≤ 9.0.2	—

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