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CVE-2026-20348 is an improper size-handling vulnerability in ClamAV's XAR file-format parser. When decompressing a malformed XAR table of contents, insufficient validation of size-related values can request an excessive allocation or exceed configured scan limits. The condition affects ClamAV versions 0.98.1 through 1.5.3 and may result in memory-corruption conditions during scanning.
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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.
22 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remotely exploitable, low-complexity ClamAV vulnerability with no required privileges or user interaction and high availability impact. Exploits are available, and Ubuntu published patches in USN-8788-1 on 2026-09-21.
An improper size-handling vulnerability in ClamAV's XAR parser that permits excessive memory allocation and bypass of scan limits.
A ClamAV XAR parser memory-corruption vulnerability caused by improper boundary checks, primarily enabling denial of service.
An improper-boundary-check vulnerability in ClamAV's XAR parser. A crafted file containing XAR content 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.