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OpenAdvisories
High · 8.7 CVE-2026-59860 EUVD-2026-44931GHSA-3hrf-2gc2-mx32

Kiota: XML Doc-Comment Newline Breakout Code Injection

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 1.32.3, Kiota is affected by a code-generation injection vulnerability in the C# XML documentation-comment sink (the description, externalDocs label, and externalDocs link fields emitted as /// … comments). When text from an OpenAPI description is written into single-line XML doc comments without stripping newline and Unicode line-terminator characters, an attacker can break out of the /// comment line and inject additional code into generated C# clients. This issue is fixed in version 1.29.1 and 1.32.3.

Affected products

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

Affected packages

EcosystemPackageAffectedFixedRecord
NuGet Microsoft.OpenApi.Kiota >= 1.30.0, < 1.32.3 1.32.3 GHSA-3hrf-2gc2-mx32
NuGet Microsoft.OpenApi.Kiota < 1.29.1 1.29.1 GHSA-3hrf-2gc2-mx32
NuGet Microsoft.OpenApi.Kiota.Builder >= 1.30.0, < 1.32.3 1.32.3 GHSA-3hrf-2gc2-mx32
NuGet Microsoft.OpenApi.Kiota.Builder < 1.29.1 1.29.1 GHSA-3hrf-2gc2-mx32

References