CVE-2026-66038 - FFmpeg LCL/ZLIB Video Decoder Information Disclosure via lcldec.c

CVE-2026-66038 - FFmpeg LCL/ZLIB Video Decoder Information Disclosure via lcldec.c

https://cvefeed.io/rssfeed/latest.atom / Sat, 07/25/2026 - 01:07
CVE ID :CVE-2026-66038
Published : July 24, 2026, 8:18 p.m. | 2 hours, 32 minutes ago
Description :FFmpeg through 8.1.2, fixed in commit 8670835, contains an information disclosure vulnerability in the LCL/ZLIB video decoder that allows attackers to expose uninitialized heap memory by supplying a valid zlib stream that inflates to fewer bytes than the expected frame size. The zlib_decomp() function in lcldec.c treats short decompression as non-fatal and continues to the RGB24 conversion path, which copies a full frame's worth of rows from the allocation buffer using original frame dimensions, causing uninitialized heap contents including pointer-derived allocator bytes to be copied into the attacker-observable AVFrame output and potentially defeating ASLR in long-lived media processing services.
Severity: 7.1 | HIGH
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