Description
A flaw was found in Undertow. This vulnerability allows a remote attacker to construct specially crafted requests where header names are parsed differently by Undertow compared to upstream proxies. This discrepancy in header interpretation can be exploited to launch request smuggling attacks, potentially bypassing security controls and accessing unauthorized resources.
Affected products
redhat: build of apache camel - hawtio; redhat: build of apache camel for spring boot; redhat: data grid; redhat: fuse; redhat: jboss enterprise application platform; redhat: jboss enterprise application platform expansion pack; redhat: process automation; redhat: single sign-on; redhat: undertow; redhat: enterprise linux
References4
- access.redhat.com/security/cve/CVE-2026-28368 Vendor Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2443261 Issue TrackingVendor Advisory
- access.redhat.com/errata/RHSA-2026:25125
- access.redhat.com/errata/RHSA-2026:25126
Metrics
- CVSS 3.1
-
9.1
CRITICAL
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - EPSS — exploit probability
- 1% percentile: 55 · as of 12 November 2026
- CWE
- CWE-444
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.