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CVE-2026-20337 is an out-of-bounds write vulnerability in the ZIP archive parser of ClamAV. The flaw is caused by improper boundary checking and incorrect ZIP catalogue capacity tracking while indexing local file headers during archive scanning. When ClamAV processes a crafted ZIP file, the parser can write beyond a heap allocation, leading to memory corruption and termination of the scanning process. The issue affects ClamAV versions 1.5.0 through 1.5.3 and is fixed in version 1.5.4.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Vulnerability in the ClamAV ZIP archive parser caused by improper input parameter validation during ZIP file scanning, allowing an unauthenticated remote attacker to submit crafted archives and cause denial of service, impacting scanning availability.
A heap out-of-bounds write issue in ClamAV ZIP catalogue capacity tracking while indexing local file headers.
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.