Updated: October 29th, 2026 TL;DR: The HTTP2Shell vulnerability (CVE-2026-111497) is a critical flaw in Google’s Brotli decompression decoder that could allow attackers to corrupt memory and potentially execute malicious code. With a CVSS v4.0 score of 9.2, the vulnerability affects software beyond Node.js, creating potential exposure across cloud native applications and their dependencies. Security teams …