CVE-2026-39864
MediumCVSS 4.4Exploitation Probability (EPSS)
Low risk22th percentile - higher than 22% of all known CVEs
Summary
Kamailio before versions 6.0.5 and 5.8.7 contains an out-of-bounds read vulnerability in the auth module. A specially crafted SIP packet can cause a process crash (DoS) after successful user authentication without a database backend.
Risk Assessment
An attacker can remotely crash the SIP server, leading to disruption of communication services.
Recommendation
Update Kamailio to version 6.0.5 or 5.8.7, which include a fix for this vulnerability.
Original NVD description (English source)
Kamailio is an open source implementation of a SIP Signaling Server. Prior to 6.0.5 and 5.8.7, an out-of-bounds read in the auth module of Kamailio (formerly OpenSER and SER) allows remote attackers to cause a denial of service (process crash) via a specially crafted SIP packet if a successful user authentication without a database backend is followed by additional user identity checks. This vulnerability is fixed in 6.0.5 and 5.8.7.