CVE-2026-71867 Orval: RCE via schema property name -> computed-property-key injection in the MSW mock generator
Attacker-controlled schema property names can inject JavaScript into generated MSW mock factories, leading to code execution in developer or CI environments.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-71867?
CVE-2026-71867 is a critical code injection vulnerability in orval-labs orval, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Orval generates type-safe JavaScript clients in TypeScript from OpenAPI v3 and Swagger v2 specifications. Prior to 8.21.0, a single quote in a schema property name is emitted into single-quoted object keys in generated MSW mock factories without safe encoding. This permits attacker-controlled JavaScript to be evaluated when the generated mock factory is called by tests or an MSW handler, resulting in code execution in the developer, CI, test, or application environment. The affected code is packages/core/src/getters/keys.ts function getKey and MSW mock generation. This issue is fixed in version 8.21.0.
Which versions are affected by CVE-2026-71867?
2 open source packages ship an affected version, including orval.
| Package | Affected | Fixed in |
|---|---|---|
orval npm | All versions | 8.21.0 |
orval npm | All versions | 8.21.0 |
How do I fix CVE-2026-71867?
Upgrade orval to 8.21.0 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-71867 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-71867 exists.
Sources
Also known as GHSA-2w86-xfrc-g85r, ROOT-APP-NPM-CVE-2026-71867.