Is CVE-2026-39864 actively exploited?

No active exploitation of CVE-2026-39864 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-39864 be exploited remotely?

Yes. CVE-2026-39864 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-39864?

CVE-2026-39864 has a CVSS score of 4.4 (MEDIUM).

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MEDIUM

CVE-2026-39864

CWE-125Published: April 8, 2026· Updated: Apr 8, 2026

4.4

CVSS v3.1

EPSS:0.17%probability of exploitation in 30 daysPercentile:38.4th

Official Description

Kamailio is an open source implementation of a SIP Signaling Server. Prior to 6.0.5 and 5.8.7, an out-of-bounds read in the auth module of Kamailio (formerly OpenSER and SER) allows remote attackers to cause a denial of service (process crash) via a specially crafted SIP packet if a successful user authentication without a database backend is followed by additional user identity checks. This vulnerability is fixed in 6.0.5 and 5.8.7.

NVD Source

Technical Analysis

CVE-2026-39864 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 4.4.