GHSA-j382-5jj3-vw4j
Undertow HTTP server core doesn't properly validate the Host header in incoming HTTP requests
At a glance
- Published
- Updated
- CVE
- CVE-2025-12543
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
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.
Affected packages
| Package | Versions |
|---|---|
| Maven · io.undertow:undertow-core | 2.4.0.Alpha1 |
| Maven · io.undertow:undertow-core | introduced 2.3.0.Alpha1, fixed 2.3.21.Final |
| Maven · io.undertow:undertow-core | introduced 0, fixed 2.2.39.Final |
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-12543 ADVISORY
- https://github.com/undertow-io/undertow/pull/1860 WEB
- https://github.com/undertow-io/undertow/pull/1857 WEB
- https://issues.redhat.com/browse/UNDERTOW-2656 WEB
- https://github.com/undertow-io/undertow/releases/tag/2.3.21.Final WEB
- https://github.com/undertow-io/undertow/releases/tag/2.2.39.Final WEB
- https://github.com/undertow-io/undertow PACKAGE
- https://bugzilla.redhat.com/show_bug.cgi?id=2408784 WEB
- https://access.redhat.com/security/cve/CVE-2025-12543 WEB
- https://access.redhat.com/errata/RHSA-2026:4924 WEB
- https://access.redhat.com/errata/RHSA-2026:4917 WEB
- https://access.redhat.com/errata/RHSA-2026:4916 WEB
- https://access.redhat.com/errata/RHSA-2026:4915 WEB
- https://access.redhat.com/errata/RHSA-2026:3892 WEB
- https://access.redhat.com/errata/RHSA-2026:3891 WEB
- https://access.redhat.com/errata/RHSA-2026:3890 WEB
- https://access.redhat.com/errata/RHSA-2026:3889 WEB
- https://access.redhat.com/errata/RHSA-2026:0386 WEB
- https://access.redhat.com/errata/RHSA-2026:0384 WEB
- https://access.redhat.com/errata/RHSA-2026:0383 WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |