kamailio: Kamailio is an open source implementation of a SIP Signaling Server
CVE-2026-39863 is fixed in kamailio on 1 platform, first by DEBIAN-CVE-2026-39863, released April 8, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| kamailio · Debian 13.5 (trixie) | 6.0.1-1+deb13u2 | DEBIAN-CVE-2026-39863 | Apr 8, 2026 |
| kamailio · Debian 14 | 6.1.1-2 | DEBIAN-CVE-2026-39863 | Apr 8, 2026 |
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