High severity7.5NVD Advisory· Published Jul 16, 2026· Updated Aug 17, 2026
CVE-2026-59861
CVE-2026-59861
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
Microsoft.OpenAPI.KiotaNuGet | >= 1.30.0, < 1.32.0 | 1.32.0 |
Microsoft.OpenAPI.Kiota.BuilderNuGet | >= 1.30.0, < 1.32.0 | 1.32.0 |
Microsoft.OpenApi.KiotaNuGet | < 1.29.1 | 1.29.1 |
Microsoft.OpenApi.Kiota.BuilderNuGet | < 1.29.1 | 1.29.1 |
Affected products
1- Range: <1.29.1, <1.32.0
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-xg2h-5xr2-29jwghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-59861ghsaADVISORY
- github.com/microsoft/kiota/commit/fee1b648bb4394ba7ba72de9c0ce4f2a0bad0cb6nvdWEB
- github.com/microsoft/kiota/pull/7746nvdWEB
- github.com/microsoft/kiota/releases/tag/v1.32.0nvdWEB
- github.com/microsoft/kiota/security/advisories/GHSA-xg2h-5xr2-29jwnvdWEB
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