CVE-2026-76456 Cisco NX-OS Software Security Hardening Release: October 2026 - Improper Input Validation Vulnerabilities
Improper input validation in Cisco NX-OS allows attackers to inject commands, potentially leading to code execution on network devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-76456?
CVE-2026-76456 is a high-severity command injection vulnerability in Cisco NX-OS Software, published on 7 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-20
Which versions are affected by CVE-2026-76456?
How do I fix CVE-2026-76456?
No fix has been published for CVE-2026-76456 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-76456 being exploited?
There is no known exploitation of CVE-2026-76456 in the wild and no public exploit code.
Sources
Also known as GHSA-w55m-537w-hc8q.