RCE in Microsoft Kiota
CVE-2026-105796
Kiota is an OpenAPI based HTTP Client code generator. From 0.5.0 until 1.35.0, Kiota's Java and PHP documentation-comment sanitizers delete block-comment terminators rather than neutralizing them, allowing overlapping characters to reform a terminator and place attacker-controlled OpenAPI text outside a generated documentation comment. The Java sanitizer also removes non-ASCII characters after deleting terminators, which can create a new terminator during normalization. Exploitation requires a developer or build pipeline to generate source from the malicious description and then compile and load the Java output or load the PHP output, after which injected code executes in the consuming application or build environment context. The version range is based on the Java defect and does not assert that PHP generation existed in every affected release. This issue is fixed in version 1.35.0.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Microsoft Kiota — versions >= 0.5.0, < 1.35.0
- Microsoft Microsoft.openapi.kiota — versions >= 0.5.0, < 1.35.0
- Microsoft Microsoft.openapi.kiota.builder — versions >= 0.5.0, < 1.35.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-105796?
- CVE-2026-105796 is a high-severity vulnerability in Microsoft Kiota, classified under Code Injection. CVSS score: 8.8/10. Published 2026-10-06.
- How severe is CVE-2026-105796?
- High severity. CVSS v3 base score is 8.8 out of 10.