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.