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CVE-2026-4424 is a heap out-of-bounds read vulnerability in libarchive's RAR archive-processing logic. Improper validation of the LZSS sliding-window size after transitions between compression methods allows a specially crafted RAR archive to trigger reads beyond the valid heap buffer. An unauthenticated remote attacker can exploit an application that processes the archive with vulnerable libarchive code to disclose sensitive heap-memory information without user interaction.
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No public exploit code observed for this vulnerability.
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38 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-accessible vulnerability requiring no privileges or user interaction, with high confidentiality impact and no stated integrity or availability impact. The referenced Alma Linux advisory patch was published on 2026-04-22.
An important-severity, remotely exploitable vulnerability with low attack complexity and no authentication or user interaction required. The supplied CVSS vectors indicate high confidentiality impact but no integrity or availability impact.
A high-severity, unauthenticated remote heap out-of-bounds read vulnerability in libarchive's RAR processing logic. A crafted RAR archive can expose sensitive heap-memory contents because the LZSS sliding-window size is insufficiently validated after compression-method transitions.
A libarchive information disclosure vulnerability caused by a heap out-of-bounds read during RAR archive processing.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.