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Microsoft Releases Emergency .NET Patches for Critical Brotli Flaw

The flaw can let attackers crash systems, leak memory or gain remote code execution on unpatched installations.

Summary by BleepingComputer
Microsoft released emergency .NET security updates to patch a critical vulnerability known as Broccoli2Shell, also tracked as Node2Shell and HTTP2Shell. [...]

8 Articles

Microsoft documented a critical vulnerability in the Brotli decoder, present in .NET versions and development tools. Although the notice indicates that no exploitation is reported and that the attack code is not proven, the company published updates for several products. *** The CVE-2026-111497 describes an off-limits writing in the Brotli library used by .NET. Microsoft assigned a base CVSS score of 8.1 and notes that the failure can be exploit…

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Multiple vulnerabilities have been discovered in Microsoft .Net. They allow an attacker to cause an increase in privileges.

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BleepingComputer broke the news in Melville, United States on Monday, October 26, 2026.
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