Input validation error in Cisco NX-OS Software - CVE-2026-76456
Published: October 8, 2026
Vulnerability identifier: #VU154015
CSH Severity: High
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-76456
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in Cisco NX-OS Software when processing special elements used in commands. A remote attacker can exploit the input-validation weakness over the network to cause a denial of service.
Affected devices are vulnerable regardless of device configuration.
Affected software
Cisco NX-OS Software
How to mitigate CVE-2026-76456
Install security update from vendor's website.
Cisco NX-OS Software - addressed in versions 8.4(14), 9.4(5a), 10.3(10), 10.4(8), 10.5(6), 10.6(4), 16.0(9h), 16.1(6g), 16.2(3g)