Bug#1134950: undertow: CVE-2026-28367

[Moritz Mühlenhoff]

Source: undertow
X-Debbugs-CC: team at security.debian.org
Severity: important
Tags: security

Hi,

The following vulnerability was published for undertow.

CVE-2026-28367[0]:
| A flaw was found in Undertow. A remote attacker can exploit this
| vulnerability by sending `\r\r\r` as a header block terminator. This
| can be used for request smuggling with certain proxy servers, such
| as older versions of Apache Traffic Server and Google Cloud Classic
| Application Load Balancer, potentially leading to unauthorized
| access or manipulation of web requests.

https://bugzilla.redhat.com/show_bug.cgi?id=2443260


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-28367
    https://www.cve.org/CVERecord?id=CVE-2026-28367

Please adjust the affected versions in the BTS as needed.