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CVE-2026-20348 is a memory corruption vulnerability in ClamAV's XAR file format parser. The flaw is caused by improper boundary and size handling when processing XAR content, specifically while decompressing a malformed table of contents. In affected versions, the parser can request excessive memory allocation or exceed scan limits due to insufficient validation of size-related values in crafted XAR data. An unauthenticated remote attacker can trigger the issue by supplying a specially crafted file containing malicious XAR content to a system that uses ClamAV to scan untrusted files. Successful exploitation can terminate the scanning process and may permit broader impact because the underlying condition involves memory corruption.
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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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A ClamAV parser vulnerability that could allow a remote, unauthenticated attacker to trigger a denial-of-service condition in affected Cisco Secure Endpoint Connector deployments.
A ClamAV XAR parser flaw in size handling that can trigger excessive allocation requests or exceed scan limits when decompressing a malformed table of contents.
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.