Vulnerability Description
Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.32.5, Kiota emitted x-ms-kiota-info clientClassName and clientNamespaceName values without identifier or path sanitization as both generated client class or namespace names and generated output path components when `kiota generate` ran without -c/--class-name, allowing an attacker-controlled or compromised OpenAPI description to write generated source outside the -o output directory and inject arbitrary text into generated class or namespace declarations. This issue is fixed in version 1.29.1 and 1.32.5 by GenerationConfiguration.SanitizeClientClassName and SanitizeClientNamespaceName.
Related Weaknesses (CWE)
References
- https://github.com/microsoft/kiota/commit/dc812dbbf88ef7edf53a890d36b2f9d1460e94
- https://github.com/microsoft/kiota/pull/7884
- https://github.com/microsoft/kiota/releases/tag/v1.32.5
- https://github.com/microsoft/kiota/security/advisories/GHSA-4vv7-jj25-4gh6
FAQ
What is CVE-2026-59866?
CVE-2026-59866 is a documented vulnerability. Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.32.5, Kiota emitted x-ms-kiota-info clientClassName and clientNamespaceName values without identifier or path sanitization a...
How severe is CVE-2026-59866?
CVSS scoring is not yet available for CVE-2026-59866. Check NVD for updates.
Is there a patch for CVE-2026-59866?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.