Detections
Analytics
CVE-2025-12543
critical
Description
A flaw was found in the Undertow HTTP server core, which is used in WildFly, JBoss EAP, and other Java applications. The Undertow library fails to properly validate the Host header in incoming HTTP requests.As a result, requests containing malformed or malicious Host headers are processed without rejection, enabling attackers to poison caches, perform internal network scans, or hijack user sessions.
References
https://access.redhat.com/errata/RHSA-2026:4924
https://access.redhat.com/errata/RHSA-2026:4917
https://access.redhat.com/errata/RHSA-2026:4916
https://access.redhat.com/errata/RHSA-2026:4915
https://access.redhat.com/errata/RHSA-2026:3892
https://access.redhat.com/errata/RHSA-2026:3891
https://access.redhat.com/errata/RHSA-2026:3890
https://access.redhat.com/errata/RHSA-2026:3889
https://access.redhat.com/errata/RHSA-2026:0386