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Critical severityOSV Advisory· Published Jan 20, 2026· Updated Jan 21, 2026

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

CVE-2026-23947

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

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
@orval/corenpm
>= 8.0.0-rc.0, < 8.0.28.0.2
@orval/corenpm
< 7.19.07.19.0

Affected products

1

Patches

1
9e5d93533904

fix(enum): x-enum values must be JS escaped (#2796)

https://github.com/orval-labs/orvalMellowareJan 19, 2026via ghsa
commit
1 file changed · +18 −10
  • packages/core/src/getters/enum.ts+18 −10 modified
    @@ -5,23 +5,31 @@ import {
   NamingConvention,
   type OpenApiSchemaObject,
 } from '../types';
-import { conventionName, isNumeric, sanitize } from '../utils';
+import { conventionName, isNumeric, jsStringEscape, sanitize } from '../utils';
 
 export function getEnumNames(schemaObject: OpenApiSchemaObject | undefined) {
-  return (
-    schemaObject?.['x-enumNames'] ||
-    schemaObject?.['x-enumnames'] ||
-    schemaObject?.['x-enum-varnames']
-  );
+  const names =
+    schemaObject?.['x-enumNames'] ??
+    schemaObject?.['x-enumnames'] ??
+    schemaObject?.['x-enum-varnames'];
+
+  if (!names) return;
+
+  return (names as string[]).map((name: string) => jsStringEscape(name));
 }
 
 export function getEnumDescriptions(
   schemaObject: OpenApiSchemaObject | undefined,
 ) {
-  return (
-    schemaObject?.['x-enumDescriptions'] ||
-    schemaObject?.['x-enumdescriptions'] ||
-    schemaObject?.['x-enum-descriptions']
+  const descriptions =
+    schemaObject?.['x-enumDescriptions'] ??
+    schemaObject?.['x-enumdescriptions'] ??
+    schemaObject?.['x-enum-descriptions'];
+
+  if (!descriptions) return;
+
+  return (descriptions as string[]).map((description: string) =>
+    jsStringEscape(description),
   );
 }

Vulnerability mechanics

Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

6

News mentions

0

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