Skip to content
OpenAdvisories
Critical · 9.3 CVE-2026-59866 EUVD-2026-44936GHSA-4vv7-jj25-4gh6

Kiota: Arbitrary file write + code-injection via x-ms-kiota-info clientClassName and clientNamespaceName

Published Jul 16, 2026 · Updated Aug 17, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
microsoft kiota >= 1.30.0, < 1.31.1, < 1.29.1 —

Affected packages

EcosystemPackageAffectedFixedRecord
NuGet Microsoft.OpenApi.Kiota >= 1.30.0, < 1.32.5 1.32.5 GHSA-4vv7-jj25-4gh6
NuGet Microsoft.OpenApi.Kiota < 1.29.1 1.29.1 GHSA-4vv7-jj25-4gh6
NuGet Microsoft.OpenApi.Kiota.Builder >= 1.30.0, < 1.32.5 1.32.5 GHSA-4vv7-jj25-4gh6
NuGet Microsoft.OpenApi.Kiota.Builder < 1.29.1 1.29.1 GHSA-4vv7-jj25-4gh6

References