CVE-2026-106804

A stack-based buffer overflow exists in Kamailio v6.1.3 and v6.1.4 in the ims_qos_npn module. The w_rx_aar_register() function copies the attacker-controlled host field from the SIP `Via` header into a fixed 46-byte stack buffer without validating its length. An unauthenticated remote attacker can trigger the vulnerability with a crafted SIP `REGISTER` request, causing stack corruption and termination of the affected Kamailio instance, resulting in denial of service.

• CWE-20
• CWE-120
• CWE-121

• https://gist.github.com/hackeryounow/f5af75502ea6df600428c46bb9bbf39e
• https://github.com/kamailio/kamailio/issues/4953
• https://github.com/kamailio/kamailio/issues/4953

Published

Nov 2, 2026

Last Modified

Nov 2, 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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