CVE-2026-59860
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.
How to fix
- Microsoft.OpenApi.Kiota1.32.3, 1.29.1 or later
- Microsoft.OpenApi.Kiota.Builder1.32.3, 1.29.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Microsoft.OpenApi.KiotaNuGet | 1.30.0 ≤ v < 1.32.3, v < 1.29.1 | 1.32.3, 1.29.1 |
| Microsoft.OpenApi.Kiota.BuilderNuGet | 1.30.0 ≤ v < 1.32.3, v < 1.29.1 | 1.32.3, 1.29.1 |
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