Is CVE-2026-20337 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-20337?

CVE-2026-20337 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-20337

Description

A vulnerability in the zip archive parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper boundary checks for content in zip files during scanning, which may result in an out-of-bounds write condition. An attacker could exploit this vulnerability by submitting a crafted zip file for scanning. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.