CVE-2026-59862: Kiota is an OpenAPI based HTTP Client code generator

Q: How do I fix CVE-2026-59862?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Q: Is CVE-2026-59862 being exploited?

CVE-2026-59862 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-59862 affect?

CVE-2026-59862 affects affected software. Severity is high (CVSS 7.5). 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 Doc

Q: How urgent is CVE-2026-59862?

Priority 52/100. High severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTE

CVE-2026-59862 is a high-severity flaw (CVSS 7.5) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 cod

Why this priority

High severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-94
Published	2026-07-16
Last modified	2026-10-24

Publisher (CNA): GitHub, Inc.

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-07-16 15:16 UTCPublished CVE record published
2026-10-24 20:10 UTCUpdated Record last modified

Exact fixes by distribution

NuGet (.NET) · Microsoft.OpenAPI.Kiota · FIXED · 1.32.0 · vulnerable: >= 1.30.0, < 1.32.0 · source

dotnet add package Microsoft.OpenAPI.Kiota --version 1.32.0

NuGet (.NET) · Microsoft.OpenAPI.Kiota.Builder · FIXED · 1.32.0 · vulnerable: >= 1.30.0, < 1.32.0 · source

dotnet add package Microsoft.OpenAPI.Kiota.Builder --version 1.32.0

NuGet (.NET) · Microsoft.OpenApi.Kiota · FIXED · 1.29.1 · vulnerable: < 1.29.1 · source

dotnet add package Microsoft.OpenApi.Kiota --version 1.29.1

NuGet (.NET) · Microsoft.OpenApi.Kiota.Builder · FIXED · 1.29.1 · vulnerable: < 1.29.1 · source

dotnet add package Microsoft.OpenApi.Kiota.Builder --version 1.29.1

Fedora 46 · perl-Alien-Brotli · FIXED · 0.2.2-16.fc46 · FEDORA-2026-a2abe3db79 · source

sudo dnf upgrade --advisory=FEDORA-2026-a2abe3db79

Fedora ELN · mariadb-connector-odbc · FIXED · 3.2.10-1.eln159 · FEDORA-2026-b481dcd597 · source

sudo dnf upgrade --advisory=FEDORA-2026-b481dcd597

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-59862?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-59862 being exploited?

CVE-2026-59862 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-59862 affect?

CVE-2026-59862 affects affected software. Severity is high (CVSS 7.5). 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 Doc

How urgent is CVE-2026-59862?

Priority 52/100. High severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

References

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