Cisco NX-OS Software Security Hardening Release: October 2026 - Improper Handling of Exceptional Conditions Vulnerabilities

Summary

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.

Timeline

1. Oct 7, 2026, 4:15 PM UTCCVE published
2. Oct 8, 2026, 3:32 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Oct 8, 2026, 3:32 PM UTCRecord last updated

Affected versions

• Cisco Cisco NX-OS Software

  8.2(5), 7.3(5)D1(1), 8.4(2), 8.4(3), 9.2(3), 8.2(1), 7.3(1)D1(1), 9.2(2v), 7.3(0)D1(1), 7.3(4)D1(1), 9.2(1), 9.2(2t), 9.2(3y), 9.3(2), 7.3(1)DY(1), 8.1(1), 8.2(2), 8.3(2), 7.3(2)D1(3a), 9.2(4), 8.1(2), 7.3(3)D1(1), 8.2(3), 8.3(1), 8.4(1), 8.1(1b), 7.3(0)DX(1), 7.3(2)D1(1), 9.3(1), 7.3(2)D1(2), and 116 more

• Cisco Cisco NX-OS System Software in ACI Mode

  15.2(1g), 15.2(2e), 15.2(2f), 15.2(2g), 15.2(2h), 15.2(3f), 15.2(3e), 15.2(3g), 15.2(4d), 15.2(4e), 15.2(5c), 15.2(5d), 16.0(1g), 15.2(5e), 15.2(4f), 15.2(6e), 15.2(6h), 16.0(1j), 15.2(6g), 15.2(7f), 15.2(7g), 16.0(2h), 15.2(8d), 16.0(2j), 15.2(8e), 16.0(3d), 16.0(3e), 15.2(8f), 15.2(8g), 15.3(1d), and 31 more

• Cisco Cisco Unified Computing System (Managed)

  4.0(1a), 4.1(1d), 4.0(4f), 4.0(4c), 4.0(2b), 4.1(2a), 4.0(4a), 4.0(4e), 4.0(4h), 4.0(2a), 4.1(1c), 4.0(1b), 4.1(1e), 4.0(4d), 4.0(4b), 4.0(2e), 4.1(1a), 4.0(4g), 4.0(1d), 4.0(1c), 4.0(4i), 4.0(2d), 4.1(1b), 4.1(2b), 4.0(4k), 4.1(3a), 4.1(3b), 4.1(2c), 4.0(4l), 4.1(4a), and 75 more

References 1