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Critical · 9.3 Public exploit CVE-2026-23947 EUVD-2026-3590GHSA-h526-wf6g-67jv

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

Published Jan 20, 2026 · Updated Jan 21, 2026 · Assigned by GitHub_M

Vendor: orval-labs Product: orval Package: @orval/core Ecosystem: npm

Description

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.

Affected products

VendorProductAffectedFixed
orval-labs orval >= 8.0.0-rc.0, < 8.0.2, < 7.19.0 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Affected packages

EcosystemPackageAffectedFixedRecord
npm @orval/core >= 8.0.0-rc.0, < 8.0.2 8.0.2 GHSA-h526-wf6g-67jv
npm @orval/core < 7.19.0 7.19.0 GHSA-h526-wf6g-67jv

References