CISA warns of hackers now exploiting critical Node2Shell flaw - BleepingComputer

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On Tuesday, the US Cybersecurity and Infrastructure Security Agency (CISA) confirmed that hackers have begun exploiting a critical Brotli vulnerability known as Node2Shell, Broccoli2Shell, and HTTP2Shell. Tracked as CVE-2026-111497, this critical-severity flaw stems from an out-of-bounds write weakness in the Brotli decoder used to expand data compressed with Google's widely popular Brotli lossless compression algorithm. Unprivileged attackers can use a maliciously crafted Brotli-compressed stream to trigger crashes or memory leaks and, in some cases, gain remote code execution on devices with vulnerable Brotli libraries or binaries.

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