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7.5
HIGH CVSS 3.1
CVE-2026-20339
ClamAV PESpin File Format Processing Integer Overflow Vulnerability
Overview
Description

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.

Details
INFO

Published Date :

Aug. 7, 2026, 5:17 p.m.

Last Modified :

Aug. 7, 2026, 5:17 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Impact
Affected Products

The following products are affected by CVE-2026-20339 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Cisco secure_endpoint
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH [email protected]
CVSS 3.1 HIGH MITRE-CVE
Solution
Update ClamAV to the latest version to fix memory corruption and DoS vulnerabilities.
  • Update ClamAV to the latest stable release.
  • Apply vendor patches for ClamAV.
  • Rescan systems after applying updates.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-20339.

URL Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-20339 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-20339 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-20339 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-20339 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by [email protected]

    Aug. 07, 2026

    Action Type Old Value New Value
    Added Affected [{'vendor': 'Cisco', 'product': 'Cisco Secure Endpoint', 'versions': [{'status': 'affected', 'version': '7.0.5'}, {'status': 'affected', 'version': '6.2.19'}, {'status': 'affected', 'version': '7.3.3'}, {'status': 'affected', 'version': '7.2.13'}, {'status': 'affected', 'version': '6.1.5'}, {'status': 'affected', 'version': '6.3.1'}, {'status': 'affected', 'version': '6.2.5'}, {'status': 'affected', 'version': '7.3.5'}, {'status': 'affected', 'version': '6.2.1'}, {'status': 'affected', 'version': '7.2.7'}, {'status': 'affected', 'version': '7.1.1'}, {'status': 'affected', 'version': '6.3.5'}, {'status': 'affected', 'version': '6.2.9'}, {'status': 'affected', 'version': '7.3.1'}, {'status': 'affected', 'version': '6.1.7'}, {'status': 'affected', 'version': '7.2.11'}, {'status': 'affected', 'version': '7.2.3'}, {'status': 'affected', 'version': '7.1.5'}, {'status': 'affected', 'version': '6.3.3'}, {'status': 'affected', 'version': '7.3.9'}, {'status': 'affected', 'version': '6.2.3'}, {'status': 'affected', 'version': '6.1.9'}, {'status': 'affected', 'version': '6.0.9'}, {'status': 'affected', 'version': '7.2.5'}, {'status': 'affected', 'version': '6.0.7'}, {'status': 'affected', 'version': '6.3.7'}, {'status': 'affected', 'version': '1.12.3'}, {'status': 'affected', 'version': '1.8.0'}, {'status': 'affected', 'version': '1.11.1'}, {'status': 'affected', 'version': '1.12.4'}, {'status': 'affected', 'version': '1.10.0'}, {'status': 'affected', 'version': '1.12.0'}, {'status': 'affected', 'version': '1.8.1'}, {'status': 'affected', 'version': '1.10.1'}, {'status': 'affected', 'version': '1.12.1'}, {'status': 'affected', 'version': '1.12.6'}, {'status': 'affected', 'version': '1.14.0'}, {'status': 'affected', 'version': '1.10.2'}, {'status': 'affected', 'version': '1.12.7'}, {'status': 'affected', 'version': '1.12.2'}, {'status': 'affected', 'version': '1.6.0'}, {'status': 'affected', 'version': '1.9.0'}, {'status': 'affected', 'version': '1.11.0'}, {'status': 'affected', 'version': '1.7.0'}, {'status': 'affected', 'version': '1.13.0'}, {'status': 'affected', 'version': '1.8.4'}, {'status': 'affected', 'version': '1.13.1'}, {'status': 'affected', 'version': '1.9.1'}, {'status': 'affected', 'version': '1.12.5'}, {'status': 'affected', 'version': '1.13.2'}, {'status': 'affected', 'version': '8.1.7.21512'}, {'status': 'affected', 'version': '8.1.7'}, {'status': 'affected', 'version': '8.1.5'}, {'status': 'affected', 'version': '8.1.3.21242'}, {'status': 'affected', 'version': '8.1.3'}, {'status': 'affected', 'version': '8.1.5.21322'}, {'status': 'affected', 'version': '8.1.7.21417'}, {'status': 'affected', 'version': '1.14.1'}, {'status': 'affected', 'version': '1.15.1'}, {'status': 'affected', 'version': '1.15.2'}, {'status': 'affected', 'version': '1.15.3'}, {'status': 'affected', 'version': '1.15.4'}, {'status': 'affected', 'version': '1.15.5'}, {'status': 'affected', 'version': '1.15.6'}, {'status': 'affected', 'version': '1.16.0'}, {'status': 'affected', 'version': '1.16.1'}, {'status': 'affected', 'version': '1.16.2'}, {'status': 'affected', 'version': '1.16.3'}, {'status': 'affected', 'version': '1.18.0'}, {'status': 'affected', 'version': '1.18.1'}, {'status': 'affected', 'version': '1.20.0'}, {'status': 'affected', 'version': '1.21.0'}, {'status': 'affected', 'version': '1.21.1'}, {'status': 'affected', 'version': '1.21.2'}, {'status': 'affected', 'version': '1.21.3'}, {'status': 'affected', 'version': '1.22.0'}, {'status': 'affected', 'version': '1.22.1'}, {'status': 'affected', 'version': '1.22.2'}, {'status': 'affected', 'version': '1.22.3'}, {'status': 'affected', 'version': '1.22.4'}, {'status': 'affected', 'version': '1.24.0'}, {'status': 'affected', 'version': '1.24.1'}, {'status': 'affected', 'version': '1.24.2'}, {'status': 'affected', 'version': '1.24.3'}, {'status': 'affected', 'version': '1.24.4'}, {'status': 'affected', 'version': '1.26.0'}, {'status': 'affected', 'version': '1.24.5'}, {'status': 'affected', 'version': '1.26.1'}, {'status': 'affected', 'version': '1.27.0'}, {'status': 'affected', 'version': '1.15.0'}, {'status': 'affected', 'version': '1.17.0'}, {'status': 'affected', 'version': '1.17.1'}, {'status': 'affected', 'version': '1.17.2'}, {'status': 'affected', 'version': '1.19.0'}, {'status': 'affected', 'version': '1.20.1'}, {'status': 'affected', 'version': '1.20.2'}, {'status': 'affected', 'version': '1.20.3'}, {'status': 'affected', 'version': '1.20.4'}, {'status': 'affected', 'version': '1.20.5'}, {'status': 'affected', 'version': '1.20.6'}, {'status': 'affected', 'version': '1.23.0'}, {'status': 'affected', 'version': '1.23.1'}, {'status': 'affected', 'version': '1.20.7'}, {'status': 'affected', 'version': '1.20.8'}, {'status': 'affected', 'version': '1.25.0'}, {'status': 'affected', 'version': '1.25.1'}, {'status': 'affected', 'version': '1.25.2'}, {'status': 'affected', 'version': '1.27.1'}, {'status': 'affected', 'version': '1.27.2'}, {'status': 'affected', 'version': '7.3.13'}, {'status': 'affected', 'version': '7.3.15'}, {'status': 'affected', 'version': '7.4.1'}, {'status': 'affected', 'version': '7.4.1.20425'}, {'status': 'affected', 'version': '7.4.1.20439'}, {'status': 'affected', 'version': '7.4.3'}, {'status': 'affected', 'version': '7.4.3.20679'}, {'status': 'affected', 'version': '7.4.5'}, {'status': 'affected', 'version': '7.5.1.20813'}, {'status': 'affected', 'version': '7.5.1.20833'}, {'status': 'affected', 'version': '7.5.3'}, {'status': 'affected', 'version': '7.5.5'}, {'status': 'affected', 'version': '8.0.1.21160'}, {'status': 'affected', 'version': '8.0.1.21164'}, {'status': 'affected', 'version': '7.5.7'}, {'status': 'affected', 'version': '7.5.9'}, {'status': 'affected', 'version': '7.5.11'}, {'status': 'affected', 'version': '8.1.7.21585'}, {'status': 'affected', 'version': '7.5.13.21586'}, {'status': 'affected', 'version': '7.5.13.21598'}, {'status': 'affected', 'version': '8.2.1.21612'}, {'status': 'affected', 'version': '8.2.1.21650'}, {'status': 'affected', 'version': '7.5.15.21611'}, {'status': 'affected', 'version': '7.5.17.21680'}, {'status': 'affected', 'version': '8.2.3.30119'}, {'status': 'affected', 'version': '8.2.4.30130'}, {'status': 'affected', 'version': '8.4.0'}, {'status': 'affected', 'version': '7.5.19'}, {'status': 'affected', 'version': '8.4.1.30298'}, {'status': 'affected', 'version': '8.4.2.30317'}, {'status': 'affected', 'version': '8.4.1.30307'}, {'status': 'affected', 'version': '7.5.20'}, {'status': 'affected', 'version': '8.4.3'}, {'status': 'affected', 'version': '8.4.4.30419'}, {'status': 'affected', 'version': '8.4.4.30467'}, {'status': 'affected', 'version': '7.5.21.21732'}, {'status': 'affected', 'version': '8.4.5.30483'}], 'defaultStatus': 'unknown'}]
    Added Description 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.
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Added CWE CWE-190
    Added Reference https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 7.5
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact