Patch tracker / KB5130034

KB5130034: .NET 8.0 installed Security Update (October 2026)

KB5130034 is a Critical security update for .NET 8.0 installed, released 2026-10-13. It closes 26 CVEs with a maximum CVSS of 9.4. It is the 33rd largest of the 75 updates Microsoft shipped that month, by CVEs closed.

Update summary

Critical
2026-10-13
Released
26
CVEs fixed
9.4
Max CVSS v3
Critical
Severity
Deploy this cycle
Fixes 26 CVEs for .NET 8.0 installed. No confirmed in-the-wild exploitation in this set today.

Fixes 26 CVEs. Most severe CVSS 9.4 (Critical).

Microsoft Update Catalog: download KB5130034Microsoft support article
Senserva AI Opinion and rich prompt for KB5130034

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Full tracking and change history for KB5130034

Released
2026-10-13
Last changed
2026-10-13
Changes tracked
1

Senserva began recording day-to-day change history on 2026-07-07, and refreshes it several times a day. Release dates are historical where Microsoft publishes them; revision history is tracked from that date forward, so it does not include changes made before then.

Check if KB5130034 is installed

Elevated PowerShell. No output means it is not installed.

CVEs fixed by this update

Sorted exploited-first, then by CVSS. Every CVE links to its Senserva page with the full risk facts, references, and a ready-to-paste AI prompt.

CVESeverityCVSSEPSSExploited
CVE-2026-66822Critical9.4-No
CVE-2026-70196Critical9.4-No
CVE-2026-88092Critical9.4-No
CVE-2026-96229Critical9.4-No
CVE-2026-96234Critical9.4-No
CVE-2026-96238Critical9.4-No
CVE-2026-70188Critical9.1-No
CVE-2026-70007High8.8-No
CVE-2026-70035High8.8-No
CVE-2026-70174High8.8-No
CVE-2026-83520High8.8-No
CVE-2026-85363High8.8-No
CVE-2026-96224High8.8-No
CVE-2026-96235High8.8-No
CVE-2026-70175High8.1-No
CVE-2026-70197High8.1-No
CVE-2026-96225High7.8-No
CVE-2026-96231High7.8-No
CVE-2026-58280High7.5-No
CVE-2026-69651High7.5-No
CVE-2026-70183High7.5-No
CVE-2026-70186High7.5-No
CVE-2026-96232High7.5-No
CVE-2026-96233High7.5-No
CVE-2026-96236High7.5-No
CVE-2026-96237High7.5-No

Scope and sources

Affected products
Also released in October 2026

KB5099444

186 CVEs · Critical · exploited

KB5099445

175 CVEs · Critical · exploited

KB5099535

262 CVEs · Critical · exploited

KB5099536

390 CVEs · Critical · exploited

KB5099538

313 CVEs · Critical · exploited

KB5099539

315 CVEs · Critical · exploited

KB5099540

327 CVEs · Critical · exploited

KB5101649

384 CVEs · Critical · exploited

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5130034 page (Microsoft Support)Microsoft Update CatalogMicrosoft Security Update Guide

See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
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