CVE-2025-12543

CriticalCVSS 9.6/10Last modified Oct 14, 2026

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.

Metrics

CVSS 3.1 9.6/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-20

Affected software

No affected versions have been published.

Timeline

Published: Jan 7, 2026
Last modified: Oct 14, 2026
NVD status: Modified

Related CVEs from 2025

CVE-2025-125455.3The Pixel Manager for WooCommerce – Track Conversions and Analytics, Google Ads, TikTok and more plugin for WordPress is vulnerable to Infor CVE-2025-125465.4A vulnerability was determined in LogicalDOC Community Edition up to 9.2.1. This affects an unknown part of the component API Key creation U CVE-2025-125478.1A vulnerability was identified in LogicalDOC Community Edition up to 9.2.1. This vulnerability affects unknown code of the file /login.jsp o CVE-2025-125489.0A flaw was found in Eclipse Che che-machine-exec. This vulnerability allows unauthenticated remote arbitrary command execution and secret ex CVE-2025-125498.1Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in magentech Rozy - Fl CVE-2025-12559.1Untrusted Pointer Dereference vulnerability in RTI Connext Professional (Core Libraries) allows Pointer Manipulation. This issue affects Con CVE-2025-125508.1Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in jwsthemes OchaHouse CVE-2025-125517.1Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in e-plugins ListingHub listinghub allows CVE-2025-125529.8Insufficient Password Policy.This issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5.CVE-2025-125539.8Email Server Certificate Verification Disabled.This issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5.CVE-2025-125549.8Missing Security Headers.This issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5.CVE-2025-125554.3GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.1 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 th