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TI-2026-68449 Aliases CVE-2026-105796GHSA-rm89-rhwj-9j92

Code injection in Kiota Java and PHP generators via doc comments

Priority MEDIUM 42CWE-94Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-94.

Summary

Kiota from 0.5.0 before 1.35.0 has a code injection flaw in its Java and PHP doc-comment sanitizers. The sanitizers delete block-comment terminators instead of neutralizing them, so overlapping characters reform a terminator and move attacker-controlled text outside a generated comment (CWE-94). A developer or build pipeline that generates code from a malicious OpenAPI description, then compiles and loads the Java output or loads the PHP output, runs the injected code.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00896 59th percentileScored 2026-11-07
Fix Fixed kiota (microsoft): 1.35.0Microsoft.OpenApi.Kiota (microsoft): 1.35.0+3 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Microsoftkiota0.5.0 to before 1.35.01.35.0Patch availableCNA
MicrosoftMicrosoft.OpenApi.Kiota0.5.0 to before 1.35.01.35.0Patch availableCNA
MicrosoftMicrosoft.OpenApi.Kiota.Builder0.5.0 to before 1.35.01.35.0Patch availableCNA
—Microsoft.OpenApi.Kiota (NuGet)0.5.0 to before 1.35.01.35.0Patch availableGHSA-rm89-rhwj-9j92
—Microsoft.OpenApi.Kiota.Builder (NuGet)0.5.0 to before 1.35.01.35.0Patch availableGHSA-rm89-rhwj-9j92
  • kiota VendorMicrosoft Affected 0.5.0 to before 1.35.0 Fixed in 1.35.0 Patch available CNA
  • Microsoft.OpenApi.Kiota VendorMicrosoft Affected 0.5.0 to before 1.35.0 Fixed in 1.35.0 Patch available CNA
  • Microsoft.OpenApi.Kiota.Builder VendorMicrosoft Affected 0.5.0 to before 1.35.0 Fixed in 1.35.0 Patch available CNA
  • Microsoft.OpenApi.Kiota (NuGet) Vendor— Affected 0.5.0 to before 1.35.0 Fixed in 1.35.0 Patch available GHSA-rm89-rhwj-9j92
  • Microsoft.OpenApi.Kiota.Builder (NuGet) Vendor— Affected 0.5.0 to before 1.35.0 Fixed in 1.35.0 Patch available GHSA-rm89-rhwj-9j92

Remediation

Upgrade the NuGet packages Microsoft.OpenApi.Kiota and Microsoft.OpenApi.Kiota.Builder to 1.35.0. The sources list no fixed version for kiota.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA kiota (microsoft) Fixed in 1.35.0
  • Fix · CNA Microsoft.OpenApi.Kiota (microsoft) Fixed in 1.35.0
  • Fix · CNA Microsoft.OpenApi.Kiota.Builder (microsoft) Fixed in 1.35.0
  • Fix · GHSA-rm89-rhwj-9j92 Microsoft.OpenApi.Kiota (NuGet) Fixed in 1.35.0 Advisory →
  • Fix · GHSA-rm89-rhwj-9j92 Microsoft.OpenApi.Kiota.Builder (NuGet) Fixed in 1.35.0 Advisory →

Timeline

  1. 2026-10-06 Threatist record created from CVE-2026-105796
  2. 2026-10-06 Alias added: GHSA-rm89-rhwj-9j92
  3. 2026-10-06 Fix available: NuGet/[email protected], NuGet/[email protected] · GHSA-rm89-rhwj-9j92
  4. 2026-10-06 CVSS score added · GHSA-rm89-rhwj-9j92
  5. 2026-10-06 Weakness changed · GHSA-rm89-rhwj-9j92
  6. 2026-10-06 6 new references · GHSA-rm89-rhwj-9j92
  7. 2026-10-09 CISA SSVC decision points changed

References

Advisory 1

Other 5

  • TI-2026-42212 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-37256 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-26194 Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-16982 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-36863 Windows Server Update Service (WSUS) Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-33671 Microsoft SharePoint Server Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
See all 18045 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences