High severityNVD Advisory· Published Jul 16, 2026· Updated Jul 29, 2026
Kiota: Arbitrary file write + code-injection via x-ms-kiota-info clientClassName and clientNamespaceName
CVE-2026-59866
Description
Kiota is an OpenAPI based HTTP Client code generator. Prior to 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 1.32.5 by GenerationConfiguration.SanitizeClientClassName and SanitizeClientNamespaceName.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
Microsoft.OpenApi.KiotaNuGet | < 1.32.5 | 1.32.5 |
Microsoft.OpenApi.Kiota.BuilderNuGet | < 1.32.5 | 1.32.5 |
Affected products
1- Range: <1.32.5
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-4vv7-jj25-4gh6ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-59866ghsaADVISORY
- github.com/microsoft/kiota/commit/dc812dbbf88ef7edf53a890d36b2f9d1460e947dghsax_refsource_MISCWEB
- github.com/microsoft/kiota/pull/7884ghsax_refsource_MISCWEB
- github.com/microsoft/kiota/releases/tag/v1.32.5ghsax_refsource_MISCWEB
- github.com/microsoft/kiota/security/advisories/GHSA-4vv7-jj25-4gh6ghsax_refsource_CONFIRMWEB
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