high8.7
CVE-2026-59860
Microsoft Kiota: XML Doc-Comment Newline Breakout Code Injection
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| nuget | Microsoft.OpenApi.Kiota | >= 1.30.0, < 1.32.3 | 1.32.3 |
| nuget | Microsoft.OpenApi.Kiota.Builder | >= 1.30.0, < 1.32.3 | 1.32.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-3hrf-2gc2-mx32
- https://github.com/microsoft/kiota/security/advisories/GHSA-3hrf-2gc2-mx32
- https://nvd.nist.gov/vuln/detail/CVE-2026-59860
- https://github.com/microsoft/kiota/pull/7831
- https://github.com/microsoft/kiota/commit/ebb632db90aa8e3c20949337d9faa2720d64ca44
- https://github.com/microsoft/kiota/releases/tag/v1.32.3