CVE-2026-59861: Kiota is an OpenAPI based HTTP Client code generator

Q: How do I fix CVE-2026-59861?

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

Q: Is CVE-2026-59861 being exploited?

CVE-2026-59861 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-2026-59861 affect?

CVE-2026-59861 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 Ruby generator embedded OpenAPI default fields, property names, and other schema-derived strings through CodeMethodWriter.cs and SanitizeForQuotedLite

Q: How urgent is CVE-2026-59861?

Priority 55/100. High severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTE

CVE-2026-59861 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 Ruby generator embedded OpenAPI default fields, property names, and other schema-derived strings through CodeMethodWriter.cs and SanitizeForQuotedLiteral() in Writers/StringExtensions.cs into Ruby double-quoted literals without escaping #, allowing attacker-controlled #{expr}, #$var, or #@var interpolation markers to inject arbitrary Ruby code into generated

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	2.0% (top 19%)
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 21:10 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 · conda · FIXED · 26.9.4-2.fc46 · FEDORA-2026-09931756f1 · source

sudo dnf upgrade --advisory=FEDORA-2026-09931756f1

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-2026-59861?

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

Is CVE-2026-59861 being exploited?

CVE-2026-59861 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-2026-59861 affect?

CVE-2026-59861 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 Ruby generator embedded OpenAPI default fields, property names, and other schema-derived strings through CodeMethodWriter.cs and SanitizeForQuotedLite

How urgent is CVE-2026-59861?

Priority 55/100. High severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

Ruby vulnerabilities

References

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