# CVE-2026-105796: Microsoft Kiota documentation-comment injection in Java and PHP

Source: https://junglewise.ai/threats/cve-2026-105796-kiota-is-an-openapi-based-http-client-code-generator-from-0-5-0  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-06. Updated: 2026-10-06  
License: CC BY 4.0 with a link back

CVE-2026-105796 · Severity: high · CVSS 8.8 · Published 2026-10-06

Kiota is a code generator that creates HTTP clients from API specifications. Versions 0.5.0 through 1.34.x contain a flaw where malicious API descriptions can inject executable code into generated Java and PHP source files. An attacker can craft a malicious OpenAPI schema that, when processed by Kiota, produces code with injected commands that execute during compilation or runtime in the developer's or build pipeline's environment.

Technologies: [Microsoft Kiota](https://junglewise.ai/threats/technologies/kiota), [Microsoft.OpenApi.Kiota (NuGet)](https://junglewise.ai/threats/technologies/nuget-microsoft-openapi-kiota), [Microsoft.OpenApi.Kiota.Builder (NuGet)](https://junglewise.ai/threats/technologies/nuget-microsoft-openapi-kiota-builder). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft), [NuGet](https://junglewise.ai/threats/vendors/nuget).

## Quick answers

**Is CVE-2026-105796 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-105796 being exploited in the wild.

**How severe is CVE-2026-105796?** High severity, with a CVSS score of 8.8, published 6 October 2026.

**Which products and versions are affected?** Microsoft Kiota 0.5.0 to 1.34.x; Microsoft.OpenApi.Kiota (NuGet) >= 0.5.0, < 1.35.0, ECOSYSTEM:introduced=0.5.0,fixed=1.35.0; Microsoft.OpenApi.Kiota.Builder (NuGet) >= 0.5.0, < 1.35.0, ECOSYSTEM:introduced=0.5.0,fixed=1.35.0.

**Is there a fix for CVE-2026-105796?** Yes. Microsoft.OpenApi.Kiota (NuGet): upgrade to 1.35.0 or later; Microsoft.OpenApi.Kiota.Builder (NuGet): upgrade to 1.35.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-105796 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-105796?** Check whether you run Microsoft Kiota, Microsoft.OpenApi.Kiota (NuGet) or Microsoft.OpenApi.Kiota.Builder (NuGet) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Microsoft.OpenApi.Kiota (NuGet): upgrade to 1.35.0 or later

  ```sh
  dotnet add package Microsoft.OpenApi.Kiota --version 1.35.0
  ```

- Microsoft.OpenApi.Kiota.Builder (NuGet): upgrade to 1.35.0 or later

  ```sh
  dotnet add package Microsoft.OpenApi.Kiota.Builder --version 1.35.0
  ```


## Technical details

The Java and PHP documentation-comment sanitizers deleted block-comment terminators (/* and */) rather than neutralizing them, allowing attacker-controlled text in OpenAPI descriptions to escape documentation comments and inject arbitrary code. The Java sanitizer also removed non-ASCII characters after terminator deletion, which could recreate a terminator during normalization. Exploitation requires a developer or build pipeline to generate and compile/load code from a malicious OpenAPI schema.

## Affected products

- Microsoft Kiota 0.5.0 to 1.34.x

## Identifiers

- CVE-2026-105796
- GHSA-rm89-rhwj-9j92

## Timeline

- 2026-08-10: patched: Fix merged replacing delimiters instead of deleting them
- 2026-10-06: disclosed

## References

- [https://github.com/microsoft/kiota/commit/68f33b865be9273464a6efbbe17379760e51f1a4](https://github.com/microsoft/kiota/commit/68f33b865be9273464a6efbbe17379760e51f1a4)
- [https://github.com/microsoft/kiota/pull/8017](https://github.com/microsoft/kiota/pull/8017)

## Related threats

- [Kiota: Unsafe oauth_card_path references in Kiota-generated API plugin manifests](https://junglewise.ai/threats/cve-2026-105795-kiota-is-an-openapi-based-http-client-code-generator-from-1-25-1)
- [Microsoft Kiota path traversal in plugin manifest via percent-encoding bypass](https://junglewise.ai/threats/cve-2026-73851-microsoft-kiota-path-traversal-in-plugin-manifest-via-percent)
- [Microsoft Kiota SSRF and File Inclusion via OpenAPI external references](https://junglewise.ai/threats/cve-2026-59867-microsoft-kiota-ssrf-and-file-inclusion-via-openapi-external)
- [Microsoft Kiota path traversal and code injection in OpenAPI generation](https://junglewise.ai/threats/cve-2026-59866-microsoft-kiota-path-traversal-and-code-injection-in-openapi)
- [Microsoft Kiota command injection in kiota info via OpenAPI extension](https://junglewise.ai/threats/cve-2026-59865-microsoft-kiota-command-injection-in-kiota-info-via-openapi)