Is CVE-2026-120246 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-120246?

CVE-2026-120246 has a CVSS v3 severity of MEDIUM (5.5).

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CVE-2026-120246

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.