CVE-2026-39863

Name	CVE-2026-39863
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
kamailio (PTS)	bullseye	5.4.4-1	vulnerable
	bookworm	5.6.3-2	vulnerable
	trixie	6.0.1-1+deb13u1	vulnerable
	forky	6.0.5-1	vulnerable
	sid	6.1.1-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
kamailio	source	(unstable)	6.1.1-2

https://github.com/kamailio/kamailio/security/advisories/GHSA-2wj4-f825-2h2f