CVE-2026-23947 PUBLISHED

Orval MCP client is vulnerable to code injection via unsanitized x-enum-descriptions in enum generation

Assigner: GitHub_M
Reserved: 19.01.2026 Published: 20.01.2026 Updated: 21.01.2026

Orval generates type-safe JS clients (TypeScript) from any valid OpenAPI v3 or Swagger v2 specification. Versions prior to 7.19.0 until 8.0.2 are vulnerable to arbitrary code execution in environments consuming generated clients. This issue is similar in nature to CVE-2026-22785, but affects a different code path in @orval/core that was not addressed by CVE-2026-22785's fix. The vulnerability allows untrusted OpenAPI specifications to inject arbitrary TypeScript/JavaScript code into generated clients via the x-enumDescriptions field, which is embedded without proper escaping in getEnumImplementation(). I have confirmed that the injection occurs during const enum generation and results in executable code within the generated schema files. Orval 7.19.0 and 8.0.2 contain a fix for the issue.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 9.3

Product Status

Vendor orval-labs
Product orval
Versions
  • Version >= 8.0.0-rc.0, < 8.0.2 is affected
  • Version < 7.19.0 is affected

References

Problem Types

  • CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') CWE