CVE-2026-71871 Orval: Import-time RCE via header-parameter default -> zod module-level template literal
Attacker-controlled input in OpenAPI specs can execute arbitrary code during client generation or import, affecting developers and 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-2026-71871?
CVE-2026-71871 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 ${...} expression or backtick in a header parameter default is emitted into a module-level template literal emitted by zod schema generation without safe encoding. This permits attacker-controlled JavaScript to be evaluated when the generated zod schema module is imported, resulting in code execution in the developer, CI, test, or application environment. The affected code is packages/zod/src/index.ts function formatDefaultValue. This issue is fixed in version 8.21.0.
Which versions are affected by CVE-2026-71871?
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-2026-71871?
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-2026-71871 being exploited?
There is no known exploitation of CVE-2026-71871 in the wild and no public exploit code.
Sources
Also known as GHSA-8j6p-r8jg-mxqh, ROOT-APP-NPM-CVE-2026-71871.