Vulnerability · Published Jan 20, 2026 · Assigned by GitHub_M
CVE-2026-23947Orval MCP client is vulnerable to code injection via unsanitized x-enum-descriptions in enum generation
Critical 9.3
In plain English
A critical-severity command injection in orval from orval-labs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @orval/core | 8.0.2 | GHSA-h526-wf6g-67jv |
| npm | @orval/core | 7.19.0 | GHSA-h526-wf6g-67jv |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| orval-labs | orval | >= 8.0.0-rc.0, < 8.0.2< 7.19.0 |
Weakness: CWE-77 · 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
References
- https://github.com/orval-labs/orval/security/advisories/GHSA-h526-wf6g-67jv x_refsource_CONFIRM
- https://github.com/orval-labs/orval/releases/tag/v8.0.2 x_refsource_MISC