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HTTP2Shell: Brotli Decoder Flaw Could Enable Memory Corruption in Production Systems

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A newly disclosed vulnerability, tracked as CVE-2026-111497 and named HTTP2Shell, affects Google's Brotli decompression library. It is an out-of-bounds write that can occur when vulnerable decoder versions process specially crafted compressed input. Depending on the application and whether it is exploitable, consequences may include crashes, information disclosure, or remote code execution. The issue affects software that bundles or dynamically loads vulnerable Brotli implementations, including Node.js, Python, .NET applications, and container images. Engineering teams are advised to identify deployed runtimes and images and check vendor advisories, since some distributions backport fixes without changing version numbers.

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