CVE-2026-120246

Medium

Description

FFmpeg 4.4 through 9.0.2 contains a use of uninitialized variable vulnerability in the CDXL decoder that leaks stack memory into decoded pixels via unfilled HAM palette entries. Attackers can craft a type-0 CDXL file whose HAM pixels select unfilled new_palette entries in cdxl_decode_ham8() or cdxl_decode_ham6(), exposing stack bytes and pointer fragments in the BGR24 output.

SeverityMedium

CVSS5.5

Exploit probability—

ProductFFmpeg

PublishedNov 1, 2026

First seenNov 4, 2026

Weakness typeCWE-457CWE-457

How to fix

Patches

github.com/FFmpeg/FFmpeg/commit/47313ad3f9f33b892384b976fb7c09b3c85fd74e

Affected products

Product	Affected versions	Fixed in
FFmpeg FFmpeg	4.4 ≤ v ≤ 9.0.2	—

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