CVE-2026-66039 – FFmpeg MACE6 Audio Decoder Heap Out-of-Bounds Write via CAF File

CVE ID :CVE-2026-66039

Published : July 24, 2026, 8:18 p.m. | 1 hour, 32 minutes ago

Description :FFmpeg through 8.1.2, fixed in commit aafb5c6, contains a signed integer overflow vulnerability in the MACE6 audio decoder that allows attackers to corrupt heap memory by supplying a crafted CAF file with a malicious bytes_per_packet value. Attackers can craft a CAF file with oversized bytes_per_packet and frames_per_packet values in the desc chunk to trigger an integer overflow in mace_decode_frame() during output sample count computation, resulting in an undersized buffer allocation and heap out-of-bounds write that could enable code execution.

Severity: 8.8 | HIGH

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