CVE-2026-20188 Cisco Crosswork Network Controller and Cisco Network Services Orchestrator Advisory
Cisco reclassified a DoS issue in Crosswork Network Controller and NSO as a customer-configurable resource management problem, not a security vulnerability.
- 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-2026-20188?
CVE-2026-20188 is a denial of service vulnerability in Cisco Crosswork Network Change Automation, published on 6 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Following the initial publication of the Security Advisory about a denial of service (DoS) condition in Cisco Crosswork Network Controller and Cisco Network Services Orchestrator (NSO), additional information has been made available to the Cisco Product Security Incident Response Team (PSIRT). Upon further analysis, the Cisco PSIRT has reclassified this issue as a customer-configurable, resource management issue rather than a security vulnerability.
Weakness: CWE-400
Which versions are affected by CVE-2026-20188?
How do I fix CVE-2026-20188?
No fix has been published for CVE-2026-20188 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-20188 being exploited?
There is no known exploitation of CVE-2026-20188 in the wild and no public exploit code.
Sources
Also known as GHSA-m776-2hwc-9x9m.