---
id: CVE-2026-71871
title: >-
  Orval generates type-safe JavaScript clients in TypeScript from OpenAPI v3 and
  Swagger v2 specifications
summary: >-
  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
  emit…
severity: critical
cwe:
  - CWE-94
  - CWE-116
  - CWE-1336
vendor: orval
product: orval
affected:
  - orval < 8.21.0
patched:
  - orval 8.21.0
published: '2026-08-19'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:20:38.860'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71871'
references:
  - url: >-
      https://github.com/orval-labs/orval/commit/8ef1bfdf3f9bcaf9dabfbe2e42887f1c0e159ab6
    label: security-advisories@github.com
  - url: 'https://github.com/orval-labs/orval/pull/3692'
    label: security-advisories@github.com
  - url: 'https://github.com/orval-labs/orval/releases/tag/v8.21.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/orval-labs/orval/security/advisories/GHSA-8j6p-r8jg-mxqh
    label: security-advisories@github.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71871'
  - url: 'https://github.com/advisories/GHSA-8j6p-r8jg-mxqh'
tags:
  - nvd
  - ghsa
  - npm
epss: 0.00478
epssPercentile: 0.40465
aliases:
  - GHSA-8j6p-r8jg-mxqh
ecosystem: npm
ingestedAt: '2026-09-03T19:07:26.123Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-71871)

Affected packages:

- `orval < 8.21.0`

Patched in:

- `orval 8.21.0`

Source: https://github.com/advisories/GHSA-8j6p-r8jg-mxqh