CVE-2026-25141
Published: 30 January 2026
Summary
CVE-2026-25141 is a critical-severity Code Injection (CWE-94) vulnerability in Orval Orval. Its CVSS base score is 9.3 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 44.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-25141 is a code injection vulnerability (CWE-94) in Orval, a tool that generates type-safe JavaScript/TypeScript clients from OpenAPI v3 or Swagger v2 specifications. It stems from an incomplete fix for CVE-2026-23947 in Orval versions starting from 7.19.0 and prior to 7.21.0, as well as versions prior to 8.2.0. The issue resides in the jsStringEscape function within Orval's core utilities, which adequately escapes quotes but fails to handle certain characters like [], (), !, and +. This allows attackers to bypass sanitization using JSFuck techniques to craft payloads that execute arbitrary JavaScript without alphanumeric characters or quotes. The vulnerability carries a CVSS v3.1 base score of 9.8 (Critical).
Any remote attacker with network access can exploit this vulnerability without authentication, privileges, or user interaction (AV:N/AC:L/PR:N/UI:N). By supplying a malicious OpenAPI or Swagger specification to a vulnerable Orval instance, an attacker can force the execution of arbitrary JavaScript code during client generation. Successful exploitation grants high confidentiality, integrity, and availability impacts (C:H/I:H/A:H), potentially leading to full compromise of the developer's machine running Orval, such as data theft, malware deployment, or further lateral movement.
Orval's security advisories (GHSA-gch2-phqh-fg9q and GHSA-h526-wf6g-67jv) and release notes for versions 7.21.0 and 8.2.0 detail an updated fix to the jsStringEscape function that addresses the bypass. Security practitioners should immediately upgrade affected Orval installations to version 7.21.0 or later for the 7.x branch, or 8.2.0 or later for the 8.x branch, and review any generated clients from untrusted specifications. The specific code changes are visible in the Orval repository at packages/core/src/utils/string.ts.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-5007
Vulnerability details
Orval generates type-safe JS clients (TypeScript) from any valid OpenAPI v3 or Swagger v2 specification. Versions starting with 7.19.0 and prior to 7.21.0 and 8.2.0 have an incomplete fix for CVE-2026-23947. While the jsStringEscape function properly handles single quotes ('),…
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double quotes (") and so on, it is still possible to achieve code injection using only a limited set of characters that are currently not escaped. The vulnerability lies in the fact that the application can be forced to execute arbitrary JavaScript using characters such as []()!+. By using a technique known as JSFuck, an attacker can bypass the current sanitization logic and run arbitrary code without needing any alphanumeric characters or quotes. Version 7.21.0 and 8.2.0 contain an updated fix.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Code injection (CWE-94) in Orval enables remote unauthenticated attackers to supply malicious OpenAPI/Swagger specs that trigger arbitrary JavaScript execution via incomplete escaping/JSFuck bypass in jsStringEscape, directly facilitating T1190 (network-accessible app exploitation) and T1059.007 (JavaScript command interpreter abuse) for full host compromise.
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Requires timely patching of Orval to fixed versions 7.21.0 or 8.2.0, directly addressing the incomplete jsStringEscape fix for JSFuck-based code injection.
Validates OpenAPI/Swagger specification inputs to Orval, preventing malicious payloads using characters like [], (), !, + from bypassing sanitization.
Monitors system processes and verifies integrity during Orval client generation to detect unauthorized JavaScript execution from injected code.