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Vulnerabilities

Vulnerability · CVE-2026-20339

ClamAV PESpin File Format Processing Integer Overflow Vulnerability

Published Aug 7, 2026 · catalog updated Aug 7, 2026 · Cisco Cisco Secure Endpoint

Check if you run it

No confirmed exploitation is on record for CVE-2026-20339. EPSS is 0.46%. Act only if a listed version of Cisco Cisco Secure Endpoint is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.46%
Remediation
Advisory link
Affected products
vendor Cisco Cisco Secure Endpoint

A vulnerability in the PESpin file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in PESpin files during scanning, which may result in an integer overflow. An attacker could exploit this vulnerability by submitting a crafted file that contains PESpin content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Cisco Cisco Secure Endpointversion unspecified

How to fix CVE-2026-20339

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-20339. EPSS is 0.46%. Act only if a listed version of Cisco Cisco Secure Endpoint is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-190: Integer Overflow. EPSS 0.46%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 7, 2026 · CVE.org

    Updated

    A vulnerability in the PESpin file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in PESpin files during scanning, which may result in an integer overflow. An attacker could exploit this vulner

  2. Oct 23, 2026 · BSI CERT-Bund

    Detected

    CVE-2026-20339 is listed by ClamAV: Mehrere Schwachstellen ermöglichen Denial of Service und Offenlegung von Informationen.

Sources

  • BSI CERT-BundGovernment advisoryCVE-2026-20339

    ClamAV: Mehrere Schwachstellen ermöglichen Denial of Service und Offenlegung von Informationen

    wid.cert-bund.de
  • CVE.orgVulnerability recordCVE-2026-20339

    A vulnerability in the PESpin file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device. This vulnerability is due to improper boundary checks for

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-20339

    30-day exploitation probability 0.46%

    first.org

References

Freshness

Last verified in this catalog Oct 24, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.