Kiota: Code injection through doc-comment delimiter reformation in Kiota Java and PHP generators

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-105796
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 15:17:16 UTC
Updated2026-10-06 16:00:36 UTC
DescriptionKiota 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Problem Types: CWE-94 | CWE-94 CWE-94: Improper Control of Generation of Code ('Code Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Microsoft Kiota affected >= 0.5.0, < 1.35.0 Not specified
CNA Microsoft Microsoft.OpenApi.Kiota affected >= 0.5.0, < 1.35.0 Not specified
CNA Microsoft Microsoft.OpenApi.Kiota.Builder affected >= 0.5.0, < 1.35.0 Not specified

References

ReferenceSourceLinkTags
github.com/microsoft/kiota/pull/8017 [email protected] github.com
github.com/microsoft/kiota/security/advisories/GHSA-rm89-rhwj-9j92 [email protected] github.com
github.com/microsoft/kiota/commit/68f33b865be9273464a6efbbe17379760e51f1a4 [email protected] github.com
github.com/microsoft/kiota/releases/tag/v1.35.0 [email protected] github.com
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