Security Advisory

CVE-2025-12543

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-01-07 16:04:22

Last updated 2026-07-28 12:04:52

Assigner redhat

CVSS score not scored

State PUBLISHED

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.

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