CVE-2026-20278 Cisco IOS XR Software Security Hardening Release: September 2026
Cisco IOS XR contains multiple vulnerabilities involving improper neutralization, requiring a security hardening patch to mitigate potential risks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20278?
CVE-2026-20278 is a high-severity vulnerability in Cisco IOS XR Software, published on 2 Sep 2026. Any signed-in user can exploit it over the 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-2026-20278 are related to improper neutralization issues that are grouped under the Common Weakness Enumeration (CWE) CWE-707.
Weakness: CWE-707
Which versions are affected by CVE-2026-20278?
How do I fix CVE-2026-20278?
No fix has been published for CVE-2026-20278 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20278 being exploited?
There is no known exploitation of CVE-2026-20278 in the wild and no public exploit code.
Sources
Also known as GHSA-cf4p-9ff3-r3m3.