# CVE-2026-54662: swagger-typescript-api vulnerable to code injection via unescaped `servers[0].url` in fetch http-client template

> Attackers can inject malicious TypeScript code via OpenAPI specs, leading to code execution when the generated client is imported.

- **Severity:** High 8.3 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H`)
- **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:** Yes
- **Published:** 29 Jul 2026
- **Updated:** 29 Jul 2026
- **Also known as:** GHSA-hqj5-cw9f-rx67

## What is CVE-2026-54662?

CVE-2026-54662 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 OpenAPI specifications. Prior to 13.12.2, src/code-gen-process.ts createApiConfig copies servers[0].url into apiConfig.baseUrl, and templates/base/http-clients/fetch-http-client.ejs interpolates apiConfig.baseUrl into the generated HttpClient baseUrl field without escaping, allowing an attacker-controlled OpenAPI spec to inject TypeScript static field code that executes when the generated fetch client module is imported. This issue is fixed in version 13.12.2.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), CWE-1336 (Improper Neutralization of Special Elements Used in a Template Engine)

## Which versions are affected by CVE-2026-54662?

2 open source packages ship an affected version, including swagger-typescript-api.


| Package | Ecosystem | 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-2026-54662?

Upgrade swagger-typescript-api to 13.12.2 or later.

## Is CVE-2026-54662 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54662 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-54662 and fix it if it is affected.

What it is: CVE-2026-54662 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54662 exists.

Affected packages and fixed versions:
- swagger-typescript-api (npm): affected all versions; fixed in 13.12.2
- swagger-typescript-api (npm): affected all versions; fixed in 13.12.2

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-2026-54662/ (Markdown: https://insights.sbomify.com/CVE-2026-54662/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-54662
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-54662
- OSV: https://osv.dev/vulnerability/CVE-2026-54662

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-54662/
Summaries are generated and may contain mistakes; the official description above is the record.