CVE-2026-106803

A stack-based buffer overflow exists in Kamailio v6.1.3 and v6.1.4 in the ims_registrar_pcscf module. When processing a crafted application/reginfo+xml NOTIFY message, process_contact() copies an attacker-controlled port value from the alias parameter into a fixed 5-byte stack buffer without validating its length. An unauthenticated remote attacker can trigger stack corruption and terminate the P-CSCF process, resulting in denial of service.

• CWE-121

• https://gist.github.com/hackeryounow/7d7ccc9ec501a5d8c9143b2e1bcc11cb
• https://github.com/kamailio/kamailio/commit/21261436492f0014930e804e20586e3833bb91b9
• https://github.com/kamailio/kamailio/issues/4954
• https://github.com/kamailio/kamailio/pull/4958
• https://github.com/kamailio/kamailio/issues/4954

Published

Nov 2, 2026

Last Modified

Nov 3, 2026

Status

Awaiting Analysis

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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