CVE-2026-20347
ClamAV Mach-O File Format Processing Memory Corruption Vulnerability
Description
A vulnerability in the Mach-O 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 Mach-O files during scanning, which may result in an out-of-bounds buffer read. An attacker could exploit this vulnerability by submitting a crafted Mach-O file 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-125
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