Vulnerability · Published Jul 16, 2026 · Assigned by GitHub_M
CVE-2026-59860Kiota: XML Doc-Comment Newline Breakout Code Injection
High 8.7
In plain English
A high-severity code injection in kiota from microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 72% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| NuGet | microsoft.openapi.kiota | 1.32.3 | GHSA-3hrf-2gc2-mx32 |
| NuGet | microsoft.openapi.kiota | 1.29.1 | GHSA-3hrf-2gc2-mx32 |
| NuGet | microsoft.openapi.kiota.builder | 1.32.3 | GHSA-3hrf-2gc2-mx32 |
| NuGet | microsoft.openapi.kiota.builder | 1.29.1 | GHSA-3hrf-2gc2-mx32 |
Affected products (as reported)
Weakness: CWE-94 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References
- https://github.com/microsoft/kiota/security/advisories/GHSA-3hrf-2gc2-mx32 x_refsource_CONFIRM
- https://github.com/microsoft/kiota/pull/7831 x_refsource_MISC
- https://github.com/microsoft/kiota/commit/ebb632db90aa8e3c20949337d9faa2720d64ca44 x_refsource_MISC
- https://github.com/microsoft/kiota/releases/tag/v1.32.3 x_refsource_MISC