Undertow is Vulnerable to HTTP Request/Response Smuggling
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.
01
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-28368US | critical9.1 | — | ||
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… | ||||
02
references
External citations — patches, advisories, analysis.
- https://access.redhat.com/errata/RHSA-2026:25125WEB
- https://access.redhat.com/errata/RHSA-2026:25126WEB
- https://access.redhat.com/security/cve/CVE-2026-28368WEB
- https://bugzilla.redhat.com/show_bug.cgi?id=2443261WEB
- https://github.com/undertow-io/undertowPACKAGE
- https://nvd.nist.gov/vuln/detail/CVE-2026-28368ADVISORY
scry
Advisories like this name the exposed products attackers go after on your perimeter. See what is exposed on your perimeter with a free passive scan.
Free scan