high8.7
CVE-2026-28369
Undertow is Vulnerable to HTTP Request/Response Smuggling
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| maven | io.undertow:undertow-parent | <= 2.3.23.Final | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Redhat | Build Of Apache Camel - Hawtio | Version 4.0 |
| Redhat | Build Of Apache Camel For Spring Boot | Version 4.0 |
| Redhat | Data Grid | Version 8.0 |
| Redhat | Fuse | Version 7.0.0 |
| Redhat | Jboss Enterprise Application Platform | Versions 7.0.0, 8.0.0 |
| Redhat | Jboss Enterprise Application Platform Expansion Pack | All versions |
| Redhat | Process Automation | Version 7.0 |
| Redhat | Single Sign-On | Version 7.0 |
| Redhat | Undertow | All versions |
| Redhat | Enterprise Linux | Version 9.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://access.redhat.com/errata/RHSA-2026:25125
- https://access.redhat.com/errata/RHSA-2026:25126
- https://access.redhat.com/security/cve/CVE-2026-28369
- https://bugzilla.redhat.com/show_bug.cgi?id=2443262
- https://github.com/advisories/GHSA-vqqj-9cmv-hx43
- https://nvd.nist.gov/vuln/detail/CVE-2026-28369