GHSA-8v4x-mgvp-p658
Undertow is Vulnerable to HTTP Request/Response Smuggling
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Maven | io.undertow:undertow-core | < 2.2.40.Final | 2.2.40.Final |
| Maven | io.undertow:undertow-core | >= 2.3.0.Final, < 2.3.25.Final | 2.3.25.Final |
Details
As written in the advisory (Markdown source, shown as plain text).
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.
References
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2026-28368
- https://github.com/undertow-io/undertow/commit/3ece0bf2b2cf5e01db8ca25e41b831e66d3f5961
- https://github.com/undertow-io/undertow/commit/904e26f1be62fb00b440538608a9574839821878
- https://github.com/undertow-io/undertow/commit/c5dc41479e9c3576552d7e98e31bb1c237ae155e
- 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
- https://github.com/undertow-io/undertow