CVE-2026-106803: Buffer Overflow

A stack-based buffer overflow exists in Kamailio v6.1.3 and v6.1.4 in the imsregistrarpcscf module. When processing a crafted application/reginfo+xml NOTIFY message, processcontact() 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.