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Microsoft releases emergency .NET patches for critical Brotli flaw
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Fusion42 · 26 October 2026 · Fusion42 review
Microsoft has issued urgent out-of-band security patches for a critical vulnerability in the Brotli compression decoder affecting .NET versions 8 through 11 Release Candidate 3, which could allow remote code execution or privilege escalation in applications opting into Brotli decompression.
This Wire brief sits within Fusion42's coverage of Enterprise, and 2 sources have reported it.
◆ ◆ The Wire takeaway
You must update your .NET-based applications immediately to avoid critical security risks from a severe Brotli flaw that attackers can exploit remotely. Blocking Brotli-compressed requests can temporarily protect your system if patches can’t be applied right away.
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2 sources · 26 Oct 2026
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