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CVE-2026-20346 is an integer-underflow flaw in ClamAV's PDF parser when it reads a malformed hexadecimal string. Improper boundary checking during PDF scanning can result in an out-of-bounds buffer read and memory corruption. The issue affects ClamAV 1.4.5 and earlier, and versions 1.5.0 through 1.5.3.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
23 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-underflow vulnerability in ClamAV's malformed-PDF hexadecimal-string parsing that causes a crash.
A ClamAV PDF parser memory-corruption vulnerability caused by improper boundary checks and a potential out-of-bounds read, primarily enabling denial of service.
An improper-boundary-check vulnerability in ClamAV's PDF parser resulting in an out-of-bounds buffer read. A crafted PDF 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.