Microsoft Releases Emergency Patch for Critical .NET Vulnerability

Microsoft issues urgent update for .NET vulnerability CVE-2026-26127, affecting Windows, macOS, Linux. Admins must patch immediately.

By Content Team

Mar 11, 2026

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Microsoft has issued an emergency security update for a newly discovered .NET Framework vulnerability (CVE-2026-26127) that allows remote attackers to crash applications without authentication. The flaw, scored 7.5 on the CVSS scale, affects .NET 9.0 and 10.0 across Windows, macOS, and Linux systems.

The vulnerability stems from an out-of-bounds read error that can be triggered by specially crafted network requests, causing applications to crash and denying service to users. While Microsoft rates exploitation as "unlikely," an anonymous researcher has publicly disclosed the technical details, raising concerns about potential attacks.

Administrators must immediately update .NET 9.0 to version 9.0.14 and .NET 10.0 to version 10.0.4. Organizations using Microsoft.Bcl.Memory packages should also apply the corresponding patches to prevent service disruptions.

Source: Cyber Security News

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