CVE-2026-20339
ClamAV PESpin File Format Processing Integer Overflow Vulnerability
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.
Weakness: CWE-190
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco Secure Endpoint | Endpoint / EDR | cna-assigner |
Vendor-reported products (1)
- Cisco · Cisco Secure Endpoint
Vendor advisory
cisco-sa-clamav-WuuvVd26 Interim — investigation open
ClamAV Vulnerabilities Affecting Cisco Products: August 2026
Cisco’s rating: High (advisory CVSS 7.5) · Published Aug 7, 2026 · updated Aug 13, 2026 (revision 1.2)
Bug IDs: CSCwu34288 , CSCwu59475 , CSCwu65985 , CSCwu78432 , CSCwu99410 , CSCwv57797
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from