RCE in Microsoft Kiota
CVE-2026-41134
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.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (26.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: -0.001
Affected products
- Microsoft Kiota — versions >= 1.30.0, < 1.31.1, < 1.29.1, < 1.31.1
Weakness classification (CWE)
References
- github.com/microsoft/kiota/security/advisories/GHSA-2hx3-vp6r-mg3f (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-41134?
- CVE-2026-41134 is a high-severity vulnerability in Microsoft Kiota, classified under Code Injection. CVSS score: 7.8/10. Published 2026-04-22.
- How severe is CVE-2026-41134?
- High severity. CVSS v3 base score is 7.8 out of 10.