CVE-2026-20275 Cisco IOS XR Software Security Hardening Release: September 2026
Cisco IOS XR contains incorrect calculation flaws that require patching to maintain system integrity and security.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20275?
CVE-2026-20275 is a high-severity vulnerability in Cisco IOS XR Software, published on 2 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20275 are related to incorrect calculation issues that are grouped under the Common Weakness Enumeration (CWE) CWE-682.
Weakness: CWE-682
Which versions are affected by CVE-2026-20275?
How do I fix CVE-2026-20275?
No fix has been published for CVE-2026-20275 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20275 being exploited?
There is no known exploitation of CVE-2026-20275 in the wild and no public exploit code.
Sources
Also known as GHSA-jp29-xjv5-g87x.