Out-of-bounds read in Kamailio - CVE-2026-39864
Published: April 8, 2026
Vulnerability identifier: #VU125335
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-39864
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Kamailio
Affected software:
Kamailio
Kamailio
Detailed vulnerability description
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to out-of-bounds read in auth.so when processing a specially crafted SIP packet during additional user identity checks after successful RFC2617 authentication without a database backend. A remote privileged user can send a specially crafted SIP packet to cause a denial of service.
Exploitation requires a deployment that does not use a database backend and performs additional user identity checks after successful RFC2617 authentication.
How to mitigate CVE-2026-39864
Install security update from vendor's website.