CVE-2026-28368
HIGHUndertow: undertow: request smuggling via inconsistent header parsing
Title source: cnaDescription
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.
Scores
CVSS v3
8.7
EPSS
0.0003
EPSS Percentile
9.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-444
Status
published
Products (24)
io.undertow/undertow-parent
0Maven
Red Hat/Red Hat build of Apache Camel - HawtIO 4
Red Hat/Red Hat build of Apache Camel for Spring Boot 4
Red Hat/Red Hat Data Grid 8
Red Hat/Red Hat Enterprise Linux 10
Red Hat/Red Hat Enterprise Linux 8
Red Hat/Red Hat Enterprise Linux 9
Red Hat/Red Hat Fuse 7
Red Hat/Red Hat JBoss Enterprise Application Platform 7
Red Hat/Red Hat JBoss Enterprise Application Platform 8
... and 14 more
Published
Mar 27, 2026
Tracked Since
Mar 29, 2026