HIGH8.7

GHSA-8v4x-mgvp-p658

Undertow is Vulnerable to HTTP Request/Response Smuggling

Details

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.

Are you affected?

Enter the version of the package you're using.

Affected packages

Maven/io.undertow:undertow-parent

Introduced in: 0

No fixed version published yet for io.undertow:undertow-parent (maven). Pin to a known-safe version or switch to an alternative.

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]