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    CVE-2026-20338

    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.

    Published:Aug 7, 2026
    Last Modified:Aug 8, 2026
    EPS:Aug 7, 2026
    EPSS Score:0.00327
    CVSS Score:7.5

    Affected Products

    Vendor
    Cisco
    Product
    Secure Endpoint

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-415 Double Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-20347 (CVSS 7.5) — A vulnerability in the Mach-O file format parser of ClamAV could allow an unauthenticated, remote attacker to …
    CVE-2026-20346 (CVSS 7.5) — A vulnerability in the PDF file format parser of ClamAV could allow an unauthenticated, remote attacker to cau…
    CVE-2026-20337 (CVSS 7.5) — A vulnerability in the zip archive parser of ClamAV could allow an unauthenticated, remote attacker to cause a…
    CVE-2026-20243 (CVSS 7.5) — A vulnerability in the ALZ file format parser of ClamAV could allow an unauthenticated, remote attacker to cau…
    CVE-2026-20244 (CVSS 7.5) — A vulnerability in the DMG file format parser of ClamAV could allow an unauthenticated, remote attacker to cau…
    CVE-2026-20213 (CVSS 7.5) — A vulnerability in the PE file format parser of ClamAV could allow an unauthenticated, remote attacker to caus…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High