CVE-2026-54661 swagger-typescript-api vulnerable to code injection via unescaped `servers[0].url` in axios http-client template
Attackers can inject code into generated Axios clients via malicious OpenAPI specs, leading to execution during client instantiation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-54661?
CVE-2026-54661 is a high-severity code injection vulnerability in acacode swagger-typescript-api, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
swagger-typescript-api generates API clients for Fetch or Axios from an OpenAPI Specification. Prior to 13.12.2, templates/base/http-clients/axios-http-client.ejs interpolates servers[0].url from src/code-gen-process.ts into the HttpClient constructor without escaping, allowing an attacker-controlled OpenAPI spec to inject code that executes when new HttpClient() or new Api() is constructed. This issue is fixed in version 13.12.2.
Which versions are affected by CVE-2026-54661?
2 open source packages ship an affected version, including swagger-typescript-api.
| Package | Affected | Fixed in |
|---|---|---|
swagger-typescript-api npm | All versions | 13.12.2 |
swagger-typescript-api npm | All versions | 13.12.2 |
How do I fix CVE-2026-54661?
Upgrade swagger-typescript-api to 13.12.2 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-54661 being exploited?
There is no known exploitation of CVE-2026-54661 in the wild and no public exploit code.
Sources
Also known as GHSA-38c3-wv3c-v3xj.