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NVD / CVE Program· CNA GitHub_M

CVE-2026-41134: Kiota: Code Generation Literal Injection

Noroxi assessment

Priority: Monitor (action score 29/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.42% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. No special conditions are required; it is repeatable.
  • Fixed version: Microsoft.OpenApi.Kiota (NuGet) 1.31.1, 1.29.1; Microsoft.OpenApi.Kiota.Builder (NuGet) 1.31.1, 1.29.1.

Low priority for now. Upgrade to Microsoft.OpenApi.Kiota (NuGet) 1.31.1, 1.29.1; Microsoft.OpenApi.Kiota.Builder (NuGet) 1.31.1, 1.29.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.3 · v4.0—No exploit Fix available
Published
Apr 22, 2026
Updated
Oct 26, 2026
EPSS
0.4% · 36th percentile

Report tools

JSON

Action score

29

Monitor

Low priority for now.

CVSS
29 / 40 · 7.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
7.3
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-41134

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
microsoftkiota

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • microsoft kiotabefore 1.31.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • microsoft kiota

    • >= 1.30.0, < 1.31.1, < 1.29.1affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
NuGetMicrosoft.OpenApi.Kiotafrom 1.30.0 · before 1.31.11.31.1
NuGetMicrosoft.OpenApi.Kiotabefore 1.29.11.29.1
NuGetMicrosoft.OpenApi.Kiota.Builderfrom 1.30.0 · before 1.31.11.31.1
NuGetMicrosoft.OpenApi.Kiota.Builderbefore 1.29.11.29.1

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-59865Kiota: Command injection via x-ms-kiota-info dependencyInstallCommand surfaced by `kiota info`
    38Monitor
  • CVE-2026-59866Kiota: Arbitrary file write + code-injection via x-ms-kiota-info clientClassName and clientNamespaceName
    37Monitor
  • CVE-2026-59864Kiota: Path/URL injection into generated Copilot plugin manifest via x-ai-* extensions
    37Monitor

Published before and after this one in the same product

  • Later →CVE-2026-59859Jul 16, 2026 · Kiota: Code Generation Literal Injection in the PHP Generator
    34Monitor
  • Later →CVE-2026-59860Jul 16, 2026 · Kiota: XML Doc-Comment Newline Breakout Code Injection
    34Monitor
  • Later →CVE-2026-59861Jul 16, 2026 · Kiota: Code Generation Literal Injection in Kiota Ruby Generator
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
NuGet:Microsoft.OpenApi.Kiota1.29.1Package registry (OSV)
NuGet:Microsoft.OpenApi.Kiota1.31.1Package registry (OSV)
NuGet:Microsoft.OpenApi.Kiota.Builder1.29.1Package registry (OSV)
NuGet:Microsoft.OpenApi.Kiota.Builder1.31.1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-5986585 days apartKiota: Command injection via x-ms-kiota-info dependencyInstallCommand surfaced by `kiota info`
    38Monitor
  • CVE-2026-105796167 days apartKiota: Code injection through doc-comment delimiter reformation in Kiota Java and PHP generators
    35Monitor
  • CVE-2026-5985985 days apartKiota: Code Generation Literal Injection in the PHP Generator
    34Monitor
  • CVE-2026-5986085 days apartKiota: XML Doc-Comment Newline Breakout Code Injection
    34Monitor
  • CVE-2026-5986185 days apartKiota: Code Generation Literal Injection in Kiota Ruby Generator
    31Monitor
  • CVE-2026-5986285 days apartKiota: Code Generation Literal Injection in the Python Generator
    30Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
P
Scope
X

Weakness class (CWE)

CWE-94 · Improper Control of Generation of Code ('Code Injection')

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

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