Patch tracker / KB5101003

KB5101003: .NET 10.0 installed on Linux Security Update (July 2026)

KB5101003 is a High security update for .NET 10.0 installed on Linux, released 2026-07-14. It closes 1 CVE with a maximum CVSS of 8.1. The most likely of them to be attacked is CVE-2026-47304, which FIRST.org rates at 64% probability of exploitation in the next 30 days.

Update summary

High
2026-07-14
Released
1
CVEs fixed
8.1
Max CVSS
High
Severity
Deploy this cycle
Fixes 1 CVE for .NET 10.0 installed on Linux. No confirmed in-the-wild exploitation in this set today.

Fixes 1 CVE. Most severe CVSS 8.1 (High). EPSS exploit probability up to <1%. Among the lower half of tracked Microsoft updates by EPSS exploit probability.

Senserva found thiswe track every release for this product line, so we can tell you this package is behind

A newer security update for .NET 10.0 installed on Mac OS has shipped since this one: KB5122104 (2026-08-11). For cumulative update families the newer package includes these fixes, so installing that one is usually the shorter path. Verify against your own update rings before you skip this package.

Microsoft Update Catalog: download KB5101003Microsoft support article
Senserva AI Opinion for KB5101003

KB5101003 is a Security Update for .NET Framework 3.5 and 4.8.1 on Windows Server 2025, covering both full and Server Core installations. The details are still provisional: Microsoft has not published per-update CVE data for the July 2026 cycle, so this comes only from the MSRC release document, which maps no named zero-days to this update. It sits inside a large cycle of 622 CVEs and 56 Critical, so it competes for attention with many higher-profile items.

Do this: Inventory which Windows Server 2025 hosts run .NET 3.5 and 4.8.1, then stage KB5101003 for those systems and hold for the per-update CVE detail before finalizing priority.

AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for KB5101003

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

Full tracking and change history for KB5101003

Released
2026-07-14
Last changed
2026-07-14
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 KB5101003 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-2026-47304High8.164%No

Scope and sources

Affected products
Also released in July 2026

KB5099444

185 CVEs · Critical · exploited

KB5099445

174 CVEs · Critical · exploited

KB5099535

261 CVEs · Critical · exploited

KB5099536

389 CVEs · Critical · exploited

KB5099538

312 CVEs · Critical · exploited

KB5099539

314 CVEs · Critical · exploited

KB5099540

326 CVEs · Critical · exploited

KB5101649

383 CVEs · Critical · exploited

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5101003 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.
Provided as is, without warranty; verify against the vendor advisory before acting. Data notice and terms.