Disclosure summary
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.
Source-reported weakness categories
CWE-20
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2025-12543
Open original source · Updated Oct 06, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| redhat | build_of_apache_camel | * {"versionEndExcluding":"4.14.4"} |
| redhat | data_grid | 8.0 |
| redhat | fuse | 7.0.0 |
| redhat | jboss_enterprise_application_platform | * {"versionStartIncluding":"8.1.0","versionEndExcluding":"8.1.3"} |
| redhat | jboss_enterprise_application_platform | - |
| redhat | jboss_enterprise_application_platform | 7.0.0 |
| redhat | jboss_enterprise_application_platform_expansion_pack | - |
| redhat | process_automation | 7.0 |
| redhat | single_sign-on | 7.0 |
| redhat | undertow | * {"versionStartIncluding":"2.3.0","versionEndExcluding":"2.3.21"} |
Original records & references
- NIST NVD record
- CVE Program record
- access.redhat.com — Vendor Advisory
- access.redhat.com — Vendor Advisory
- access.redhat.com — Vendor Advisory
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- access.redhat.com — Vendor Advisory
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- access.redhat.com — Vendor Advisory
- bugzilla.redhat.com — Issue Tracking, Vendor Advisory
- access.redhat.com — Vendor Advisory
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- access.redhat.com — Vendor Advisory
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- access.redhat.com — Vendor Advisory
- access.redhat.com — Vendor Advisory
- access.redhat.com — Vendor Advisory
- access.redhat.com — Vendor Advisory
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- access.redhat.com
- access.redhat.com — Vendor Advisory
- bugzilla.redhat.com — Issue Tracking, Vendor Advisory
- security.access.redhat.com
PUBLISHED 2026-01-07T12:15:55-05:00
MODIFIED 2026-10-06T13:17:10-04:00
INGESTED 2026-10-08T12:40:21-04:00