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GHSA-f456-rf33-4626

GHSA-f456-rf33-4626: Orval Mock Generation Code Injection via const

I am reporting a code injection vulnerability in Orval’s mock generation pipeline affecting @orval/mock in both the 7.x and 8.x series. This issue is related in impact to the previously reported enum x-enumDescriptions (https://github.com/advisories/GHSA-h526-wf6g-67jv), but it affects a different code path in the faker-based mock generator rather than @orval/core.

The vulnerability allows untrusted OpenAPI specifications to inject arbitrary TypeScript/JavaScript into generated mock files via the const keyword on schema properties. These const values are interpolated into the mock scalar generator (getMockScalar in packages/mock/src/faker/getters/scalar.ts) without proper escaping or type-safe serialization, which results in attacker-controlled code being emitted into both interface definitions and faker/MSW handlers. I have confirmed that this occurs on orval@7.19.0 and orval@8.0.2 with mock: true, and that the generated mocks contain executable payloads such as require('child_process').execSync('id') in the output TypeScript.

openapi: 3.1.0
info:
  title: Mock Const Injection PoC
  version: 1.0.0
paths:
  /test:
    get:
      operationId: getTests
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Tests'
components:
  schemas:
    Tests:
      type: object
      properties:
        EvilString:
          type: string
          const: "'); require('child_process').execSync('id'); //"
        EvilNumber:
          type: number
          const: "0); require('child_process').execSync('id'); //"
        SafeEnum:
          type: string
          enum: ["test"]

(GitHub Advisory)

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GHSA-f456-rf33-4626

GHSA-f456-rf33-4626:

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
@orval/mock	npm	< 7.20.0	7.20.0
@orval/mock	npm	>= 8.0.0-rc.0, < 8.0.3	8.0.3

Technical Details

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Root Cause Analysis

The analysis of the provided security advisory and commit patches confirms a code injection vulnerability within the @orval/mock package. The root cause is the improper handling of const values from an OpenAPI specification during mock data generation.

The vulnerable function is getMockScalar located in packages/mock/src/faker/getters/scalar.ts. The evidence from the commits (e.g., 6d8ece07ccb80693ad43edabccb3957aceadcd06) clearly shows that the value of item.const was being used in a string template without any sanitization. For example, the line value = '${(item as SchemaObject31).const}'; demonstrates the direct inclusion of the user-provided const value into the generated code.

The fix, applied across multiple commits, involves properly escaping this value. Initially, a jsStringEscape function was introduced, and later, this was replaced with the more robust JSON.stringify to ensure the const value is treated as a safe string literal. An attacker exploiting this vulnerability could craft an OpenAPI document with a malicious payload in a const field, leading to arbitrary code execution in the environment where the orval-generated mocks are used.

Vulnerable functions

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WAF Rule

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Reasoning

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