Understanding and Defending Against CVE-2026-15565: A Denial of Service Vulnerability in Undertow
CVE-2026-15565 is a high-severity vulnerability in the Undertow web server that allows remote attackers to cause a Denial of Service (DoS) attack without authentication. This vulnerability affects several Red Hat products and has a CVSS score of 7.5. In this analysis, we will delve into the root cause, attack surface, and exploitation mechanics of this vulnerability, as well as provide guidance on detection and defense.