CVE-2026-20338

CVE Enrichment

CVSS: 7.5 HIGH
EPSS: 0.47%
EPSS Percentile: 39.81%
CISA KEV: Not listed

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 memory handling when processing content in zip files during scanning. 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 as a result of a memory double-free, resulting in a DoS condition on the affected software.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: [email protected]
Published: 08-Aug-2026 00:17
Last Modified: 24-Oct-2026 03:10
EPSS Date: 2026-10-24
CWE: CWE-415

CVSS Vector


            CVSS:3.1                            AV:N /
                            AC:L /
                            PR:N /
                            UI:N /
                            S:U /
                            C:N /
                            I:N /
                            A:H

References

[email protected]

Last enrichment sync: 02-Nov-2026 23:58
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (1)

Shortly after ClamAV rolled out the fixes, Cisco published an advisory warning that PoC code targeting CVE-2026-20337 and CVE-2026-20338 exists. Cisco Warns of Seven ClamAV Flaws Affecting Secure Endpoint; Two Have Public PoCs

CVE (4)

Vendors (1)

Products (3)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.