Arbitrary Code Injection Affecting microsoft.openapi.kiota.builder package, versions [0.5.0,1.35.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DOTNET-MICROSOFTOPENAPIKIOTABUILDER-21717172
- published26 Oct 2026
- disclosed6 Oct 2026
- creditUnknown
Introduced: 6 Oct 2026
NewCVE-2026-105796 (opens in a new tab)How to fix?
Upgrade Microsoft.OpenApi.Kiota.Builder to version 1.35.0 or higher.
Overview
Affected versions of this package are vulnerable to Arbitrary Code Injection via the sanitization process for OpenAPI descriptions. An attacker can execute arbitrary code in the context of the consuming application or build environment by supplying a crafted OpenAPI description that causes the emission of attacker-controlled Java or PHP source code outside of generated documentation comments. This is only exploitable if a developer or build pipeline generates a client from a malicious description and subsequently compiles and loads the Java output, or loads the PHP output.
Workaround
This vulnerability can be mitigated by generating clients only from trusted, integrity-protected OpenAPI descriptions, reviewing generated Java and PHP source before compiling, loading, or deploying it, and restricting the privileges and secrets available to generation and build environments.