A memory buffer bounds violation in the Chromium V8 JavaScript engine (CVE-2026-3910, CVSS 8.8) enables drive-by remote code execution against any user visiting a malicious webpage, affecting Google Chrome, Microsoft Edge, Opera, and all Chromium-based browsers; CISA KEV confirms active exploitation with a federal remediation deadline of 2026-03-27. Enterprise browser fleets represent a broad attack surface, and this class of vulnerability is frequently leveraged for initial access at scale. Deploy patched browser versions across all managed endpoints immediately, validate patch coverage via endpoint management tooling, and review proxy and EDR logs for browser processes spawning unexpected child processes as a sandbox escape indicator.