---
id: CVE-2026-76456
title: >-
  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
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…
severity: high
cvss: 8.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H'
cwe:
  - CWE-20
vendor: Cisco
product: Cisco NX-OS Software
affected:
  - nx-os_software 8.2(5)
  - nx-os_software 7.3(5)D1(1)
  - nx-os_software 8.4(2)
  - nx-os_software 8.4(3)
  - nx-os_software 9.2(3)
  - nx-os_software 8.2(1)
  - nx-os_software 7.3(1)D1(1)
  - nx-os_software 9.2(2v)
  - nx-os_software 7.3(0)D1(1)
  - nx-os_software 7.3(4)D1(1)
  - nx-os_software 9.2(1)
  - nx-os_software 9.2(2t)
  - nx-os_software 9.2(3y)
  - nx-os_software 9.3(2)
  - nx-os_software 7.3(1)DY(1)
  - nx-os_software 8.1(1)
  - nx-os_software 8.2(2)
  - nx-os_software 8.3(2)
  - nx-os_software 7.3(2)D1(3a)
  - nx-os_software 9.2(4)
  - nx-os_software 8.1(2)
  - nx-os_software 7.3(3)D1(1)
  - nx-os_software 8.2(3)
  - nx-os_software 8.3(1)
  - nx-os_software 8.4(1)
  - nx-os_software 8.1(1b)
  - nx-os_software 7.3(0)DX(1)
  - nx-os_software 7.3(2)D1(1)
  - nx-os_software 9.3(1)
  - nx-os_software 7.3(2)D1(2)
  - nx-os_software 8.2(4)
  - nx-os_software 7.3(0)DY(1)
  - nx-os_software 9.3(1z)
  - nx-os_software 9.2(2)
  - nx-os_software 8.1(2a)
  - nx-os_software 7.3(2)D1(3)
  - nx-os_software 8.1(1a)
  - nx-os_software 8.4(1a)
  - nx-os_software 9.3(3)
  - nx-os_software 7.3(2)D1(1d)
  - nx-os_software 9.3(4)
  - nx-os_software 7.3(6)D1(1)
  - nx-os_software 8.2(6)
  - nx-os_software 9.3(5)
  - nx-os_software 8.4(2a)
  - nx-os_software 8.4(2b)
  - nx-os_software 8.5(1)
  - nx-os_software 9.3(6)
  - nx-os_software 8.4(4)
  - nx-os_software 7.3(7)D1(1)
published: '2026-10-07'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T17:16:57.770'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-76456'
references:
  - url: >-
      https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-nxosw1-cWzSbtR
    label: psirt@cisco.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-07T16:38:22.250Z'
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-07T18:02:41.724889Z'
---

## Overview

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-2026-76456 are related to improper input validation of special elements used in a command issue that are grouped under the Common Weakness Enumeration (CWE) CWE-20.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.