Microsoft Kiota: Command injection via x-ms-kiota-info dependencyInstallCommand surfaced by kiota info
CVE-2026-59865GHSA-hq9q-27g5-qwpj
What to do
Vendor fix available. Upgrade each affected package to the fixed version on its release line (microsoft.openapi.kiota 1.32.5, 1.29.1; microsoft.openapi.kiota.builder 1.32.5, 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, < 1.32.5< 1.29.1
- Fixed in
- 1.29.1, 1.32.5
NuGet microsoft.openapi.kiota.builder
- Affected
- >= 1.30.0, < 1.32.5< 1.29.1
- Fixed in
- 1.29.1, 1.32.5
Sources
- GitHub Advisory Database and maintainer security advisories on GitHub
GitHub-reviewed advisory GHSA-hq9q-27g5-qwpj 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
- 9.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N · score source
- EPSS
- CVE-2026-59865: 4.36% estimated exploitation activity in the next 30 days; percentile 91.26 (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.
Summary kiota info — the command developers run to learn which packages to install after generating a client — read the x-ms-kiota-info extension from the OpenAPI description and presented the spec-supplied dependencyInstallCommand (and dependency name/version) as the tool's own recommended install command, replacing kiota's normally-trusted suggestion. With an attacker-controlled or compromised description: A developer who followed kiota's explicit instruction (run the suggested install command) executed attacker-controlled shell — command injection → RCE. The IDE-facing kiota info --json output, which the Kiota VS Code extension consumes to offer/run dependency installation, exposed the raw command string directly, so an "install dependencies" action in the IDE could run it automatically. Confirmed on Kiota 1.32.4. Details x-ms-kiota-info.languagesInformation.<language.dependencyInstallCommand was emitted verbatim as the install-command example, and dependencies[].name/version were…
Dates and revisions
- Published by the source
- Last modified by the source
- Source last checked
- Revision 1 · created ·
Published from ghsa record GHSA-hq9q-27g5-qwpj
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-2026-59865 Advisory: Microsoft Kiota: Command injection via x-ms-kiota-info dependencyInstallCommand surfaced by `kiota info` IDs: CVE-2026-59865, GHSA-hq9q-27g5-qwpj Record: https://patchnext.com/advisories/cve-2026-59865 (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: Critical (CVSS 9.3) 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 1.32.5, 1.29.1; microsoft.openapi.kiota.builder 1.32.5, 1.29.1. A vendor fix does not mean a deployment is fixed. ## Affected components - NuGet microsoft.openapi.kiota: affected >= 1.30.0, < 1.32.5; < 1.29.1; fixed in 1.29.1, 1.32.5 - NuGet microsoft.openapi.kiota.builder: affected >= 1.30.0, < 1.32.5; < 1.29.1; fixed in 1.29.1, 1.32.5 ## 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-hq9q-27g5-qwpj (GitHub-reviewed advisory GHSA-hq9q-27g5-qwpj 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.
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