Red Hat Undertow Vulnerability Allows Remote Denial of Service

CERT-Bund has published security advisory WID-SEC-2026-0830 concerning a critical vulnerability in Red Hat Undertow, a web server used in Linux environments. The vulnerability, assigned a CVSS Base Score of 5.9, allows remote, anonymous attackers to exploit a flaw to cause a Denial of Service (DoS) condition. The advisory indicates that mitigation measures are not yet available.

Organizations utilizing Red Hat Undertow should be aware of this vulnerability and monitor for updates from Red Hat and CERT-Bund regarding patches or workarounds. Given the lack of immediate mitigation, affected systems may be at risk of disruption. This advisory highlights the ongoing need for robust vulnerability management and incident response planning for web server infrastructure.