Stack-based buffer overflow in Cisco NX-OS Software - CVE-2026-76459
Published: October 8, 2026
Vulnerability identifier: #VU154018
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-76459
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information, modify data, and cause a denial of service.
The vulnerability exists due to stack-based buffer overflow issues in Cisco NX-OS Software when writes exceed stack buffer boundaries. A remote user can exploit the buffer overflow over the network to disclose sensitive information, modify data, and cause a denial of service.
Affected devices are vulnerable regardless of device configuration.
Affected software
Cisco NX-OS Software
How to mitigate CVE-2026-76459
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)