Security Digest · Vulnerability record
CVE-2026-59865: Microsoft Kiota: Command injection via x-ms-kiota-info dependencyInstallCommand surfaced by `kiota info`
Kiota is an OpenAPI based HTTP Client code generator.
CVSS 9.3 Critical EPSS 4.4% · p91
Should you act?
Critical and remotely reachable
No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 4.4%, percentile 91: FIRST’s model estimates a 4.4% chance of exploitation activity in the next 30 days, higher than 91% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes
Microsoft.OpenApi.Kiota(NuGet) >= 1.30.0, < 1.32.5, fixed in 1.32.5;Microsoft.OpenApi.Kiota.Builder(NuGet) >= 1.30.0, < 1.32.5, fixed in 1.32.5;Microsoft.OpenApi.Kiota(NuGet) < 1.29.1, fixed in 1.29.1;Microsoft.OpenApi.Kiota.Builder(NuGet) < 1.29.1, fixed in 1.29.1. Check your lockfile, including transitive dependencies.
What it is
Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.32.5, kiota info read x-ms-kiota-info.languagesInformation. .dependencyInstallCommand plus dependency name and version values from an OpenAPI description and presented the spec-supplied command as Kiota's recommended install command, allowing an attacker-controlled or compromised description to cause command injection when the suggested command was run manually or through the Kiota VS Code extension's kiota info --json dependency-install flow. This issue is fixed in version 1.29.1 and 1.32.5.
From the GitHub advisory
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
Weakness type: CWE-94, CWE-829.
Product: Microsoft.OpenApi.Kiota (NuGet) · Assigned by: GitHub_M · Published: 2026-07-16
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| NuGet | Microsoft.OpenApi.Kiota | >= 1.30.0, < 1.32.5 | 1.32.5 |
| NuGet | Microsoft.OpenApi.Kiota.Builder | >= 1.30.0, < 1.32.5 | 1.32.5 |
| NuGet | Microsoft.OpenApi.Kiota | < 1.29.1 | 1.29.1 |
| NuGet | Microsoft.OpenApi.Kiota.Builder | < 1.29.1 | 1.29.1 |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| microsoft | kiota | >= 1.30.0, < 1.31.1, < 1.29.1 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_M | 4.0 | 9.3 Critical | 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 |
| GitHub | 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 |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Attack requirements: none
- Privileges required: none (no login)
- User interaction: none
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none, automatable yes, technical impact total.
- FIRST EPSS (model of 2026-10-21): 4.36% probability of exploitation activity in the next 30 days; percentile 91.
Timeline
- — CVE record published by GitHub_M
- — GitHub-reviewed advisory GHSA-hq9q-27g5-qwpj published (critical)
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-hq9q-27g5-qwpj github.com
- CVE.org record CVE-2026-59865 cve.org
- NVD entry CVE-2026-59865 nvd.nist.gov
Other references from the CVE record and advisory
- github.com github.com
- github.com github.com
- github.com github.com
- github.com github.com