A vulnerability in Google’s Brotli data compression library, tracked as CVE-2026-111497 and dubbed Node2Shell, has led to security updates from Microsoft, the Node.js project and the maintainers of two Python packages. Node.js and the Python packages were patched last week, and Microsoft followed on October 25 with fixes for .NET, Visual Studio and PowerShell. Bun, Envoy and Istio have also been updated. Brotli is a popular choice for compressing data sent over the web, and its decoder is embedded in a long list of applications and libraries. Described as an out-of-bounds write, the bug impacts Brotli 1.0.3 through 1.2.0. Google gave it a CVSS v4 score of 9.2, which puts it in the critical category. Brotli versions 1.0.10, 1.1.1 and 1.2.1 contain the fix. The Node.js project said…