Vulnerability · Published Nov 1, 2026 · Assigned by VulnCheck

CVE-2026-120247FFmpeg 2.3 through 9.0.2 Huffyuv Decoder Uninitialized Heap Memory Disclosure

Medium 5.5

In plain English

A medium-severity security flaw in FFmpeg from FFmpeg. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).

Severity (CVSS 3.1)5.5Medium

Exploit odds (30 days)0.1%top 97.9% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	ffmpeg	no fix listed	DEBIAN-CVE-2026-120247
Debian:13	ffmpeg	no fix listed	DEBIAN-CVE-2026-120247
Debian:14	ffmpeg	no fix listed	DEBIAN-CVE-2026-120247
Ubuntu:26.10	ffmpeg	no fix listed	UBUNTU-CVE-2026-120247

Affected products (as reported)

Vendor	Product	Versions
FFmpeg	FFmpeg	2.3 – through 9.0.2

Weakness: CWE-908 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

References

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24869 issue-tracking
https://github.com/FFmpeg/FFmpeg/commit/7c73707355708c846f718cca90096bc1a33c8989 patch
https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/huffyuvdec.c#L802 technical-description
https://github.com/FFmpeg/FFmpeg product
VulnCheck Advisory: FFmpeg 2.3 through 9.0.2 Huffyuv Decoder Uninitialized Heap Memory Disclosure third-party-advisory