Kiota: Code Generation Literal Injection
CVE-2026-41134GHSA-2hx3-vp6r-mg3f
What to do
Vendor fix available. Upgrade each affected package to the fixed version on its release line (microsoft.openapi.kiota 1.31.1, 1.29.1; microsoft.openapi.kiota.builder 1.31.1, 1.29.1), redeploy, then verify what is actually installed.
This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.
Affected packages
NuGet microsoft.openapi.kiota
- Affected
- >= 1.30.0, < 1.31.1< 1.29.1
- Fixed in
- 1.31.1, 1.29.1
NuGet microsoft.openapi.kiota.builder
- Affected
- >= 1.30.0, < 1.31.1< 1.29.1
- Fixed in
- 1.31.1, 1.29.1
Sources
- GitHub Advisory Database and maintainer security advisories on GitHub
GitHub-reviewed advisory GHSA-2hx3-vp6r-mg3f lists affected ranges: NuGet microsoft.openapi.kiota >=1.30.0 =0 =1.30.0 =0 <1.29.1
VerifiedObserved Structured GitHub Advisory Database record (type=reviewed) from the GitHub REST API.
Severity and exploitation
- Exploitation
- No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
- CVSS 4.0
- 7.3 · 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 · score source
- EPSS
- CVE-2026-41134: 0.42% estimated exploitation activity in the next 30 days; percentile 36.51 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description
As published by the source; long descriptions are shortened.
CVE Advisory (CVE-2026-41134): Code Generation Literal Injection in Kiota Summary Kiota 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. Impact and Preconditions This issue is only practically exploitable when: 1. the OpenAPI description used for generation is from an untrusted source, or 2. a normally trusted OpenAPI description has been compromised/tampered with. If you only generate from trusted, integrity-protected API descriptions, risk is significantly reduced. Affected Versions - Affected: all versions < 1.29.1 and = 1.30.0, <…
Dates and revisions
- Published by the source
- Last modified by the source
- Source last checked
- Revision 1 · created ·
Published from ghsa record GHSA-2hx3-vp6r-mg3f
Agent brief
Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.
# Patch Next advisory brief: CVE-2026-41134 Advisory: Kiota: Code Generation Literal Injection IDs: CVE-2026-41134, GHSA-2hx3-vp6r-mg3f Record: https://patchnext.com/advisories/cve-2026-41134 (revision 1, source checked 26 Oct 2026, 17:05 UTC) Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected. Severity: High (CVSS 7.3) Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV. Vendor response: Vendor fix available; fixed versions by package: microsoft.openapi.kiota 1.31.1, 1.29.1; microsoft.openapi.kiota.builder 1.31.1, 1.29.1. A vendor fix does not mean a deployment is fixed. ## Affected components - NuGet microsoft.openapi.kiota: affected >= 1.30.0, < 1.31.1; < 1.29.1; fixed in 1.31.1, 1.29.1 - NuGet microsoft.openapi.kiota.builder: affected >= 1.30.0, < 1.31.1; < 1.29.1; fixed in 1.31.1, 1.29.1 ## Suggested inspection (read-only) - NuGet microsoft.openapi.kiota: check the installed version with your package manager. - NuGet microsoft.openapi.kiota.builder: check the installed version with your package manager. ## Supported action Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version. ## Required regression checks - Run the test suite and a production build. - Exercise the features that depend on microsoft.openapi.kiota, microsoft.openapi.kiota.builder. - Repeat the inspection and confirm that only fixed versions remain installed. ## Rollback considerations - Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward. ## Unresolved questions - Which deployments run an affected version? - Exploitation status can change. Check again before lowering the priority. - Mark the work resolved only after the fixed version is verified in production. ## Sources - Verified: https://github.com/advisories/GHSA-2hx3-vp6r-mg3f (GitHub-reviewed advisory GHSA-2hx3-vp6r-mg3f lists affected ranges: NuGet microsoft.openapi.kiota >=1.30.0 =0 =1.30.0 =0 <1.29.1) Commands are suggestions: review each one before running it.
Loading voting…