Vulnerability Report

CVE-2026-28368

Title: Undertow Request Smuggling via header parsing discrepancy

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-28368.

CWE Category CWE-444

Published Date Mar 27, 2026

Modified Date Oct 14, 2026

Exploit Status Not Found

Score 8.7 CVSS v3.1

Exploit Probability (EPSS)

0.89%

Vulnerability Summary

CVE-2026-28368: 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.

Impacted Vendors

Reference Links

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

CVSS v3.1

Source Entity [email protected]

Severity CRITICAL

9.1

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1

Source Entity [email protected]

Severity HIGH

8.7

Attack Vector

NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

CHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns