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CVE-2026-20346 is a memory-corruption vulnerability in ClamAV's PDF file format parser. The flaw is caused by improper boundary checking while processing PDF content during scanning; more specifically, the issue is described as an integer underflow in PDF parsing that can occur while reading a malformed hex string, leading to an out-of-bounds buffer read. A remote, unauthenticated attacker can trigger the condition by supplying a crafted PDF file to a system that uses ClamAV to scan submitted content. Successful exploitation can terminate the ClamAV scanning process and may have broader consequences consistent with memory-corruption conditions.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.