Patch tracker / KB5059200

KB5059200: .NET 8.0 installed on Linux Security Update (May 2025)

KB5059200 is a High security update for .NET 8.0 installed on Linux, released 2025-05-13. It closes 1 CVE with a maximum CVSS of 8.0. It is the eighth largest of the 18 updates Microsoft shipped that month, by CVEs closed.

Update summary

High
2025-05-13
Released
1
CVEs fixed
8.0
Max CVSS
High
Severity
Deploy this cycle
Fixes 1 CVE for .NET 8.0 installed on Linux. No confirmed in-the-wild exploitation in this set today.

Fixes 1 CVE. Most severe CVSS 8.0 (High). EPSS exploit probability up to 1.1%. 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 8.0 installed on Windows 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 KB5059200Microsoft support article
Senserva AI Opinion for KB5059200

.NET 8.0 running on Windows, Linux, or macOS is exposed to CVE-2025-26646, a High severity flaw rated CVSS 8.0, fixed by KB5059200 from May 2025. Because .NET 8.0 runs on all three major operating systems, this affects a broad mix of developer machines, build servers, and any production host running .NET 8 applications regardless of platform. It is not currently in CISA KEV or linked to ransomware, but an 8.0 score merits prompt attention.

Do this: Update .NET 8.0 runtimes on Windows, Linux, and macOS hosts to include KB5059200.

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

Senserva AI Opinion and rich prompt for KB5059200

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

Full tracking and change history for KB5059200

Released
2025-05-13
Last changed
2025-05-13
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 KB5059200 is installed

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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-2025-26646High8.01.1%No

Scope and sources

Affected products
Also released in May 2025

KB5058449

23 CVEs · High · exploited

KB5061195

1 CVE · High · exploited

KB5061196

1 CVE · High · exploited

KB5061197

1 CVE · High · exploited

KB5058380

1 CVE · High · exploited

KB5002695

1 CVE · High

KB5002711

2 CVEs · High

KB5059201

1 CVE · High

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5059200 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.