Bug 2564498 (CVE-2026-120246) - CVE-2026-120246 ffmpeg: ffmpeg: Information disclosure via uninitialized palette entries in CDXL decoder
Summary: CVE-2026-120246 ffmpeg: ffmpeg: Information disclosure via uninitialized pale...
Keywords:
Status: NEW
Alias: CVE-2026-120246
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2565015 2565018 2565022 2565028 2565031 2565035 2565038 2565041 2565045 2565047 2565050 2565054
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-01 01:02 UTC by OSIDB Bzimport
Modified: 2026-11-02 10:33 UTC (History)
1 user (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-11-01 01:02:13 UTC 
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.
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