Cisco NX-OS Software Security Hardening Release: October 2026

cisco-sa-hardening-nxosw1-cWzSbtR · Cisco · October 7, 2026

Summary

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.

From Cisco (vendor's own words, quoted), quoted as published. Check the source before acting.

What to do

Cisco has released software updates that address this vulnerability.

Vendor fix or mitigation, quoted from the advisory.

Each CVE in this advisory

CVE	Severity	Known exploited	Exploit likelihood	Weakness
CVE-2026-76453	8.8 high	No	0.4%	—
CVE-2026-76455	9.8 critical	No	4.0%	—
CVE-2026-76456	8.6 high	No	0.3%	—
CVE-2026-76457	8.6 high	No	0.3%	—
CVE-2026-76458	8.6 high	No	0.3%	—
CVE-2026-76459	8.8 high	No	0.3%	—

Severity from the advisory (CVSS), known exploitation from CISA's catalog, exploit likelihood from EPSS (next 30 days).

Affected products

Vendor	Product	Affected versions	Fixed
Cisco	Cisco NX-OS Software	7.3(0)N1, 7.3(2)N1, 7.3(1)N1, 8.1, 8.2, 7.3(2)D1, 7.3(1)D1, 7.3(0)DX, 7.3(0)D1, 7.3(1)DY, 7.3(0)DY, 7.3(3)N1, 9.2, 8.3, 7.3(4)N1, 7.3(3)D1, 7.3(4)D1, 7.3(5)N1, 8.4, 9.3	—
Cisco	Cisco Unified Computing System (Managed)	4.0, 4.1, 4.2, 4.3, 6.0	—
Cisco	Cisco NX-OS System Software in ACI Mode	15.2, 16.0, 15.3, 16.1, 16.2	—

Why it's on these mode pages

Maritime: Vendor table: Cisco (network and remote-access gear used in every mode, all modes) (matched by rule)
Pipeline: Vendor table: Cisco (network and remote-access gear used in every mode, all modes) (matched by rule)
Freight rail: Vendor table: Cisco (network and remote-access gear used in every mode, all modes) (matched by rule)
Passenger rail and transit: Vendor table: Cisco (network and remote-access gear used in every mode, all modes) (matched by rule)
Highway and motor carrier: Vendor table: Cisco (network and remote-access gear used in every mode, all modes) (matched by rule)
Postal and parcel: Vendor table: Cisco (network and remote-access gear used in every mode, all modes) (matched by rule)

Change history

October 7, 2026: Initial public release.
November 9, 2026: First collected by Watch

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