GitHub Advisoryadvisory · Maven
GHSA-8v4x-mgvp-p658 Undertow is Vulnerable to HTTP Request/Response Smuggling
HIGH
Official page ↗
- Aliases
- CVE-2026-28368
- Ecosystem
- Maven
- Packages
- io.undertow:undertow-parent
- Severity
- High
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
- Weaknesses
- CWE-444
- Reviewed
- 2026-03-31
Affected packages
• Maven io.undertow:undertow-parent: <= 2.3.23.Final (no fix yet)
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.
Related
Alias · CVE (1)
- CVE-2026-28368 A flaw was found in Undertow. vulnerability
Weakness · CWE (1)
- CWE-444 Inconsistent Interpretation of HTTP Requests weakness
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-28368 advisory
- https://access.redhat.com/errata/RHSA-2026:25125 web
- https://access.redhat.com/errata/RHSA-2026:25126 web
- https://access.redhat.com/security/cve/CVE-2026-28368 web
- https://bugzilla.redhat.com/show_bug.cgi?id=2443261 web
- https://github.com/undertow-io/undertow package