CVE-2026-76458
Cisco NX-OS Software Security Hardening Release: October 2026 - Improper Handling of Exceptional Conditions Vulnerabilities
Description
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco NX-OS engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-76458 are related to improper handling of exceptional conditions issues that are grouped under the Common Weakness Enumeration (CWE) CWE-703.
Weakness: CWE-703
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco NX-OS Software | Routing & Switching | cna-assigner |
| Cisco | Cisco Unified Computing System (UCS) | Other Products | cna-assigner |
Vendor-reported products (3)
- Cisco · Cisco NX-OS Software
- Cisco · Cisco NX-OS System Software in ACI Mode
- Cisco · Cisco Unified Computing System (Managed)
Vendor advisory
cisco-sa-hardening-nxosw1-cWzSbtR
Cisco NX-OS Software Security Hardening Release: October 2026
Cisco’s rating: Critical (advisory CVSS 9.8) · Published Oct 7, 2026
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from