
Node2Shell: Reproducing CVE-2026-111497 in the Node.js Brotli decoder
Node2Shell is Datadog Security Labs' analysis of CVE-2026-111497, an out-of-bounds write in the Google Brotli 1.2.0 decoder, fixed in Node.js 22.23.4, 24.22.1 and 26.12.1 on 21 October 2026. It explains the unchecked return value in DecodeBlockTypeAndLength(), the read and write primitives, and why code execution is still engineering effort. It lists inbound and outbound exposure paths, behavioral detections and what WAFs miss.
AppSec, Blue Team & Detection, Offensive SecurityΒ· Published and added 29 Oct 2026






















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