CVE-2026-59861
High
Description
Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.32.0, Kiota's Ruby generator embedded OpenAPI default fields, property names, and other schema-derived strings through CodeMethodWriter.cs and SanitizeForQuotedLiteral() in Writers/StringExtensions.cs into Ruby double-quoted literals without escaping #, allowing attacker-controlled #{expr}, #$var, or #@var interpolation markers to inject arbitrary Ruby code into generated model classes. This issue is fixed in version 1.29.1 and 1.32.0.
SeverityHigh
CVSS7.5
Exploit probability—
ProductMicrosoft.openapi.kiota
PublishedJul 16, 2026
First seenJul 16, 2026
Weakness typeCWE-94Code injection
How to fix
Update
- Microsoft.OpenAPI.Kiota1.32.0 or later
- Microsoft.OpenAPI.Kiota.Builder1.32.0 or later
- Microsoft.OpenApi.Kiota1.29.1 or later
- Microsoft.OpenApi.Kiota.Builder1.29.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Microsoft.OpenAPI.KiotaNuGet | 1.30.0 ≤ v < 1.32.0 | 1.32.0 |
| Microsoft.OpenAPI.Kiota.BuilderNuGet | 1.30.0 ≤ v < 1.32.0 | 1.32.0 |
| Microsoft.OpenApi.KiotaNuGet | v < 1.29.1 | 1.29.1 |
| Microsoft.OpenApi.Kiota.BuilderNuGet | v < 1.29.1 | 1.29.1 |
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