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CVE-2026-20339 is an integer-overflow vulnerability in ClamAV's PESpin file-format unpacker. Insufficient boundary checks on PESpin content can cause an arithmetic overflow while rebuilding a PE file, resulting in an undersized heap allocation followed by a heap out-of-bounds write. ClamAV versions 0.90 through 1.5.3 are affected.
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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.
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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.
27 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A ClamAV vulnerability addressed by Ubuntu USN-8788-1.
An integer-overflow flaw in ClamAV's PESpin unpacker that can produce an undersized allocation and heap out-of-bounds write.
A ClamAV PESpin parser memory-corruption vulnerability caused by improper boundary checks and a potential integer overflow, primarily enabling denial of service.
An integer-overflow and improper-boundary-check vulnerability in ClamAV's PESpin parser. A crafted PESpin-containing file submitted for scanning can terminate the ClamAV scanning process, causing denial of service.
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.