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Vulnerability details

CVE-2026-23947

orval-labs orval

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

CVSS 4.0
9.3Critical

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.

CVSS scores

ScoreVersionSourceVector
9.3Critical 4.0 CVEProject cvelistV5 (CNA) (GitHub_M) 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

Affected products

VendorProductVersionsSource
orval-labs orval < 7.19.0 CVEProject cvelistV5 (CNA)
orval-labs orval >= 8.0.0-rc.0, < 8.0.2 CVEProject cvelistV5 (CNA)

References and advisories

2
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Details

Published
2026-01-20
Last updated
2026-01-21
State
Published
Assigner (CNA)
GitHub_M

Exploit prediction (EPSS)

0.83%
Probability of exploitation in 30 days
58%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
Yes
Exploitation
None
Technical impact
Total

Weaknesses (CWE)

  • CWE-77
    Improper Neutralization of Special Elements used in a Command ('Command Injection')