Out-of-bounds read in Kamailio - CVE-2026-39863
Published: April 8, 2026
Vulnerability identifier: #VU125334
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-39863
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to out-of-bounds access in the Kamailio core when processing a specially crafted data packet sent over TCP. A remote attacker can send a specially crafted data packet over TCP to cause a denial of service.
The issue impacts instances having TCP or TLS listeners.
Affected software
Kamailio
How to mitigate CVE-2026-39863
Install security update from vendor's website.
Kamailio - addressed in versions 5.8.8, 6.0.6, 6.1.1