CVE WatchJul 15, 2026

CVE-2025-12543

A flaw was found in the Undertow HTTP server core, which is used in WildFly, JBoss EAP, and other Java applications. The Undertow library fa

CVSS

9.6

Critical

EPSS

1.2%

p64

KEV

—

Exploit Today

0-100

Published: Jan 7, 2026 · Last modified: Jul 15, 2026 · CWE-20

EPSS · 30d

1.2%EPSS · 30 days1.2%

2026-06-302026-07-16

Technical 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.

Official references

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