# 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.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 May 2026
- **Updated:** 14 May 2026
- **Also known as:** GHSA-m776-2hwc-9x9m

## 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 (Uncontrolled Resource Consumption)

## 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.

## Is CVE-2026-20188 being exploited?

There is no known exploitation of CVE-2026-20188 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-20188 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-20188 in the wild and no public exploit code.

Affected product: Cisco Crosswork Network Change Automation. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-20188/ (Markdown: https://insights.sbomify.com/CVE-2026-20188/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-20188
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20188
- OSV: https://osv.dev/vulnerability/CVE-2026-20188

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-20188/
Summaries are generated and may contain mistakes; the official description above is the record.