CVE-2026-120246 - FFmpeg 4.4 through 9.0.2 Uninitialized Memory Disclosure via CDXL HAM Decoder

CVE-2026-120246 - FFmpeg 4.4 through 9.0.2 Uninitialized Memory Disclosure via CDXL HAM Decoder

https://cvefeed.io/rssfeed/latest.atom / Sun, 11/01/2026 - 04:27
CVE ID :CVE-2026-120246
Published : Nov. 1, 2026, 1:17 a.m. | 2 hours, 7 minutes ago
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.
Severity: 6.8 | MEDIUM
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