SAN JOSE, California — In a brutal week for enterprise network defenders, networking giant Cisco Systems has disclosed its second actively exploited zero-day vulnerability in as many days. The latest flaw, carrying a maximum-severity rating of 10, targets the Cisco Identity Services Engine (ISE)—the critical backbone many organizations rely on to enforce network access policies, […]
Critical Vulnerabilities Discovered in Unbound DNS Resolver: NLnet Labs Releases Emergency Patches for Version 1.26.1
By Swati Khandelwal September 17, 2026 Executive Summary & Main Facts In a critical security advisory published on Wednesday, maintainer NLnet Labs announced the immediate release of Unbound DNS resolver version 1.26.1. This emergency update addresses a severe, high-severity heap overflow vulnerability—tracked as CVE-2026-81642—alongside eight other security flaws affecting every iteration of the software released […]