CVE Watch7 ago 2026

CVE-2026-66038

FFmpeg through 8.1.2, fixed in commit 8670835, contains an information disclosure vulnerability in the LCL/ZLIB video decoder that allows at

CVSS

6.5

Medio

EPSS

0.4%

p36

KEV

—

Exploit Today

0-100

Publicado: 24 jul 2026 · Última mod.: 7 ago 2026 · CWE-908

EPSS · 30d

0.2%EPSS · 30 días0.4%

2026-08-272026-09-25

Descripción técnica

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.

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