The flaw (CVE-2026-111497) is in Brotli, the Google compression library used by Node.js and many web servers and apps. A specially crafted compressed request can crash a service, leak memory or, in some cases, run an attacker’s code, with no login needed. CISA added it to its list of actively exploited vulnerabilities on October 27, and security firms have logged attack attempts against their honeypots.
Why it matters: Brotli sits inside software most businesses never think about, from website back ends to some firewall and virtualization products.
One step today: ask your developer, web host or IT provider whether anything you run uses Node.js or Brotli, and apply the vendor updates. Patched services need a restart for the fix to take effect.
Not sure what is exposed? Call (818) 791-0055 or visit contact VanquishNet.
Sources: CISA, BleepingComputer, SecurityWeek.