Vulnerability · Published Mar 27, 2026 · Assigned by redhat
CVE-2026-28368Undertow: undertow: request smuggling via inconsistent header parsing
High 8.7
In plain English
A high-severity security flaw in Red Hat build of Apache Camel for Spring Boot 4 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | undertow | no fix listed | DEBIAN-CVE-2026-28368 |
| Maven | io.undertow:undertow-core | 2.2.40.Final | GHSA-8v4x-mgvp-p658 |
| Maven | io.undertow:undertow-core | 2.3.25.Final | GHSA-8v4x-mgvp-p658 |
| Ubuntu:25.10 | undertow | no fix listed | UBUNTU-CVE-2026-28368 |
| Ubuntu:26.04:LTS | undertow | no fix listed | UBUNTU-CVE-2026-28368 |
| Ubuntu:26.10 | undertow | no fix listed | UBUNTU-CVE-2026-28368 |
Affected products (as reported)
Weakness: CWE-444 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
References
- RHSA-2026:25125 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:25126 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-28368 vdb-entry, x_refsource_REDHAT
- RHBZ#2443261 issue-tracking, x_refsource_REDHAT