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CVE-2026-59862· NVD / CVE Program· CNA GitHub_M

Kiota: Code Generation Literal Injection in the Python Generator

Noroxi assessment

Priority: Monitor (action score 30/100)

  • 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: 1.3% (FIRST EPSS); higher than 71.2% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: microsoft kiota 1.29.1.

Low priority for now. Upgrade to microsoft kiota 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

Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.32.0, Kiota's Python generator let attacker-controlled enum value descriptions from x-ms-enum.values[].description flow through KiotaBuilder.SetEnumOptions into Documentation.DescriptionTemplate and PythonConventionService.RemoveInvalidDescriptionCharacters without newline sanitization, allowing generated inline comments to split and execute attacker-controlled Python code at module scope when generated modules were imported. This issue is fixed in version 1.29.1 and 1.32.0.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Jul 16, 2026
Updated
Aug 17, 2026
EPSS
1.4% · 71th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.4%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
7.5
NVD has not scored this yet; the score shown is the CNA’s.

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.

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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.

—

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.Kiotabefore 1.29.11.29.1
NuGetMicrosoft.OpenAPI.Kiotafrom 1.30.0 · before 1.32.01.32.0
NuGetMicrosoft.OpenApi.Kiota.Builderbefore 1.29.11.29.1
NuGetMicrosoft.OpenAPI.Kiota.Builderfrom 1.30.0 · before 1.32.01.32.0

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
  • CVE-2026-105796Kiota: Code injection through doc-comment delimiter reformation in Kiota Java and PHP generators
    35Monitor
  • CVE-2026-59860Kiota: XML Doc-Comment Newline Breakout Code Injection
    34Monitor
  • CVE-2026-59859Kiota: Code Generation Literal Injection in the PHP Generator
    34Monitor

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
microsoft kiota1.29.1 · descriptionVendor (CNA)
NuGet:Microsoft.OpenApi.Kiota1.29.1Package registry (OSV)
NuGet:Microsoft.OpenAPI.Kiota1.32.0Package registry (OSV)
NuGet:Microsoft.OpenApi.Kiota.Builder1.29.1Package registry (OSV)
NuGet:Microsoft.OpenAPI.Kiota.Builder1.32.0Package 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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-2026-598650 days apartKiota: Command injection via x-ms-kiota-info dependencyInstallCommand surfaced by `kiota info`
    38Monitor
  • CVE-2026-10579682 days apartKiota: Code injection through doc-comment delimiter reformation in Kiota Java and PHP generators
    35Monitor
  • CVE-2026-598590 days apartKiota: Code Generation Literal Injection in the PHP Generator
    34Monitor
  • CVE-2026-598600 days apartKiota: XML Doc-Comment Newline Breakout Code Injection
    34Monitor
  • CVE-2026-598610 days apartKiota: Code Generation Literal Injection in Kiota Ruby Generator
    31Monitor
  • CVE-2026-4113485 days apartKiota: Code Generation Literal Injection
    29Monitor

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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

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

CVSS vector

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

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✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records