What’s Vulnerable › Vulnerabilities

CVE-2026-28368: Undertow: undertow: request smuggling via inconsistent header parsing

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-27 · updated 2026-10-26
• Weakness: CWE-444

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: 4.0
• RedHat Build Of Apache Camel For Spring Boot: 4.0
• RedHat Data Grid: 8.0
• Red Hat Enterprise Linux: 9.0
• Red Hat Fuse: 7.0.0
• Red Hat JBoss EAP: 7.0.0, 8.0.0
• RedHat Jboss Enterprise Application Platform Expansion Pack: all versions
• RedHat Process Automation: 7.0
• Red Hat Single Sign-On: 7.0
• Red Hat undertow: all versions

References

• https://access.redhat.com/errata/RHSA-2026:25125
• https://access.redhat.com/errata/RHSA-2026:25126
• https://access.redhat.com/security/cve/CVE-2026-28368
• https://bugzilla.redhat.com/show_bug.cgi?id=2443261

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