Wire · technology
Microsoft Releases Emergency .NET Patches for Critical Brotli Flaw
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Fusion42 · 28 October 2026 · Fusion42 review
Microsoft has issued emergency out-of-band patches for .NET versions 8 through 11 Release Candidate 3 to fix a critical buffer overflow vulnerability in Google's Brotli compression algorithm that allows remote code execution. The flaw affects most cloud environments and has public exploits, prompting urgent update advisories from Microsoft and OpenAI.
This Wire brief sits within Fusion42's coverage of Enterprise Software, and 4 sources have reported it between 26 Oct 2026 and 28 Oct 2026.
◆ ◆ The Wire takeaway
You must patch your .NET installations immediately or risk remote exploits due to a critical flaw in Brotli compression affecting most cloud environments. Your security posture depends on swift updates or applying network blocks to untrusted compressed data.
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4 sources · first reported 26 Oct 2026 · latest 28 Oct 2026
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