Cisco NX-OS Software Security Hardening Release: October 2026

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco NX-OS Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.

These vulnerabilities were found during internal testing and are not known to be actively exploited. To assist customers in patching and streamline the disclosure process, Cisco has grouped these issues by their underlying vulnerability class — Common Weakness Enumeration (CWE) — and assigned a single Common Vulnerabilities and Exposures identifier (CVE ID).

Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.

CVE-2026-76453 — Cisco NX-OS Software Security Hardening Release: October 2026 - Improper Neutralization Vulnerabilities (CVSS 3.1 8.8, CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) CVE-2026-76455 — Cisco NX-OS Software Security Hardening Release: October 2026 - Improper Access Control Vulnerabilities (CVSS 3.1 9.8, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) CVE-2026-76456 — Cisco NX-OS Software Security Hardening Release: October 2026 - Improper Input Validation Vulnerabilities (CVSS 3.1 8.6, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H) CVE-2026-76457 — Cisco NX-OS Software Security Hardening Release: October 2026 - Out-of-bounds Read (CVSS 3.1 8.6, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H) CVE-2026-76458 — Cisco NX-OS Software Security Hardening Release: October 2026 - Improper Handling of Exceptional Conditions Vulnerabilities (CVSS 3.1 8.6, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H) CVE-2026-76459 — Cisco NX-OS Software Security Hardening Release: October 2026 - Out-of-bounds Write Vulnerabilities (CVSS 3.1 8.8, CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)