Vulnerability Description
Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.32.5, Kiota resolved OpenAPI $ref values by fetching remote http(s) URLs and reading local absolute or out-of-tree file paths, allowing `kiota generate` on an attacker-controlled or attacker-influenced description to perform build-time SSRF, remote file inclusion, and local file inclusion by inlining external schemas such as REMOTE_KIOTA_PROP or Leaked into generated clients. This issue is fixed in version 1.29.1 and 1.32.5 by AllowedExternalOriginsStreamLoader and the --allowed-external-origins option.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/microsoft/kiota/commit/cccd798027f0a20db796b3df6c64f9897a39d7
- https://github.com/microsoft/kiota/pull/7888
- https://github.com/microsoft/kiota/releases/tag/v1.32.5
- https://github.com/microsoft/kiota/security/advisories/GHSA-rg4h-fpcp-2qm8
FAQ
What is CVE-2026-59867?
CVE-2026-59867 is a vulnerability with a CVSS score of 7.1 (HIGH). Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.32.5, Kiota resolved OpenAPI $ref values by fetching remote http(s) URLs and reading local absolute or out-of-tree file path...
How severe is CVE-2026-59867?
CVE-2026-59867 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-59867?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.