high7.5
CVE-2026-39863
Kamailio is an open source implementation of a SIP Signaling Server.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Kamailio | Kamailio | before 5.8.8 from 6.0.0 before 6.0.6 Version 6.1.0 |