libarchive: libarchive: Information disclosure via heap out-of-bounds read in RAR archive processing

A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processing logic due to improper validation of the LZSS sliding window size after transitions between compression methods. A remote attacker can exploit this by providing a specially crafted RAR...

RHEL 8 : libarchive (RHSA-2026:8521)

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:8521 advisory. The libarchive programming library can create and read several different streaming archive formats, including GNU tar, cpio, and ISO 9660...

Libarchive: libarchive: information disclosure via heap out-of-bounds read in rar archive processing

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UBUNTU-CVE-2026-4424

A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processing logic due to improper validation of the LZSS sliding window size after transitions between compression methods. A remote attacker can exploit this by providing a specially crafted RAR...

Microsoft Windows Defender - 'mpengine.dll' Memory Corruption

Windows Defender inspects a variety of different archive formats, among others RAR. Inspection of mpengine.dll revealed that the code responsible for processing RAR archives appears to be a forked and modified version of the original unrar code; given that it still processes the VMSFUPCASE filter...