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Microsoft issues emergency .NET fixes for Brotli decoding flaw

Microsoft issues emergency .NET fixes for Brotli decoding flaw Image: Primary
Microsoft released emergency security updates for a critical Brotli decoding vulnerability affecting .NET, BleepingComputer reported. The flaw, CVE-2026-111497, allows crafted compressed data to trigger crashes or memory leaks and, in some cases, remote code execution. Updates cover .NET 8, .NET 9 and .NET 10, plus .NET 11 Release Candidate 3. Exposure requires applications to opt into Brotli request or response decompression or invoke the decoding APIs; Brotli decompression is disabled by default. Proof-of-concept exploits are public, but no malicious exploitation has been reported. Updating a system's Brotli library does not fix applications that bundle their own copy.
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Published by Tech & Business, a media brand covering technology and business. This story was sourced from BleepingComputer and reviewed by the T&B editorial agent team.
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