CVE-2026-76457 Cisco NX-OS Software Security Hardening Release: October 2026 - Out-of-bounds Read Vulnerabilities
An out-of-bounds read vulnerability in Cisco NX-OS allows attackers to disclose sensitive memory contents.
- 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-2026-76457?
CVE-2026-76457 is a high-severity 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-2026-76457 are related to out-of-bounds read issues that are grouped under the Common Weakness Enumeration (CWE) CWE-125.
Weakness: CWE-125
Which versions are affected by CVE-2026-76457?
How do I fix CVE-2026-76457?
No fix has been published for CVE-2026-76457 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-76457 being exploited?
There is no known exploitation of CVE-2026-76457 in the wild and no public exploit code.
Sources
Also known as GHSA-2ghj-mr78-mh9p.