CVE-2026-28368
High
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.
SeverityHigh
CVSS8.7
Exploit probability—
Product
Redhat Undertow
PublishedMar 27, 2026
First seenMar 27, 2026
Weakness typeCWE-444CWE-444
How to fix
Update
- io.undertow:undertow-core2.2.40.Final, 2.3.25.Final or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| redhat undertow | No range specified | — |
| redhat build_of_apache_camel_-_hawtio | 4.0 | — |
| redhat build_of_apache_camel_for_spring_boot | 4.0 | — |
| redhat data_grid | 8.0 | — |
| redhat fuse | 7.0.0 | — |
| redhat jboss_enterprise_application_platform | 7.0.0, 8.0.0 | — |
| redhat jboss_enterprise_application_platform_expansion_pack | No range specified | — |
| redhat process_automation | 7.0 | — |
| redhat single_sign-on | 7.0 | — |
| redhat enterprise_linux | 9.0 | — |
| io.undertow:undertow-parentMaven | v ≤ 2.3.23.Final | — |
| io.undertow:undertow-coreMaven | v < 2.2.40.Final, 2.3.0.Final ≤ v < 2.3.25.Final | 2.2.40.Final, 2.3.25.Final |
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