high7.5
CVE-2026-59861
Microsoft Kiota: Code Generation Literal Injection in Kiota Ruby Generator
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| nuget | Microsoft.OpenAPI.Kiota | >= 1.30.0, < 1.32.0 | 1.32.0 |
| nuget | Microsoft.OpenAPI.Kiota.Builder | >= 1.30.0, < 1.32.0 | 1.32.0 |
| nuget | Microsoft.OpenApi.Kiota | < 1.29.1 | 1.29.1 |
| nuget | Microsoft.OpenApi.Kiota.Builder | < 1.29.1 | 1.29.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-xg2h-5xr2-29jw
- https://github.com/microsoft/kiota/security/advisories/GHSA-xg2h-5xr2-29jw
- https://nvd.nist.gov/vuln/detail/CVE-2026-59861
- https://github.com/microsoft/kiota/pull/7746
- https://github.com/microsoft/kiota/commit/fee1b648bb4394ba7ba72de9c0ce4f2a0bad0cb6
- https://github.com/microsoft/kiota/releases/tag/v1.32.0