CVE-2026-28369
High
Description
A flaw was found in Undertow. When Undertow receives an HTTP request where the first header line starts with one or more spaces, it incorrectly processes the request by stripping these leading spaces. This behavior, which violates HTTP standards, can be exploited by a remote attacker to perform request smuggling. Request smuggling allows an attacker to bypass security mechanisms, access restricted information, or manipulate web caches, potentially leading to unauthorized actions or data exposure.
SeverityHigh
CVSS8.7
Exploit probability—
Product
Redhat Data Grid
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 data_grid | 8.0 | — |
| redhat build_of_apache_camel_-_hawtio | 4.0 | — |
| redhat build_of_apache_camel_for_spring_boot | 4.0 | — |
| 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 undertow | No range specified | — |
| 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 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.