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CVE

CVE-2026-23947

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

CVE-2026-23947

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

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.3
-
4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23947.json, https://github.com/orval-labs/orval/releases/tag/v8.0.2, https://github.com/orval-labs/orval/security/advisories/GHSA-h526-wf6g-67jv, https://nvd.nist.gov/vuln/detail/CVE-2026-23947

Severity

0

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
0
EPSS Probability
0.00032%
EPSS Percentile
0.093%
Introduced Version
bcfb93eda1d9a6edea902322012364f82cc0dcff,0
Fix Available
200f7dbbc59e4e84286ccf2cbeb9fed515f98bab,eefd96fa12a6a95a5b99d1b6646d4cd06729d0e4

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