Kamailio: community verdicts

2 notable / known-exploited Kamailio CVEs the community has triaged.

ⓘ Not an exhaustive list: we focus on the findings that matter (exploited / notable). For every Kamailio CVE, see NVD ↗.

CVE-2026-39863HIGH 7.5Real · low riskEPSS 0%
Kamailio is an open source implementation of a SIP Signaling Server. Prior to 6.1.1, 6.0.6, and 5.8.8, an out-of-bounds access in the core of Kamailio (formerly OpenSER and SER) allows remote attackers to cause a denial of service (process crash) via a specially crafted data packet sent over TCP. The issue impacts Kamailio instances having TCP or TLS listeners. This vulnerability is fixed in 5.1.1, 6.0.6, and 5.8.8.
CVE-2026-39864MED 4.4EPSS 0%
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.