GHSA-p3jp-9v83-76w9: Microsoft Security Advisory CVE-2026-111497 - .NET Brotli Decoder Out-of-bounds Write Vulnerability

A buffer overflow vulnerability exists in the Brotli decompression library used by .NET. This vulnerability may allow an unauthenticated attacker to read or corrupt process memory. This could lead to information disclosure, denial of service, or elevation of privilege.

ASP.NET Core and HttpClient do not automatically decompress Brotli data in their default configurations. Applications are exposed when they enable Brotli decompression or explicitly use Brotli decompression APIs to process attacker-controlled data, as described below. .NET Framework is not affected.