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.
History

Thu, 09 Apr 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 09 Apr 2026 08:30:00 +0000

Type Values Removed Values Added
First Time appeared Kamailio
Kamailio kamailio
Vendors & Products Kamailio
Kamailio kamailio

Wed, 08 Apr 2026 20:15:00 +0000

Type Values Removed Values Added
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.
Title Kamailio Core: TCP Data Processing Vulnerability
Weaknesses CWE-119
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-04-08T19:55:56.632Z

Updated: 2026-04-09T13:52:38.030Z

Reserved: 2026-04-07T19:13:20.379Z

Link: CVE-2026-39863

cve-icon Vulnrichment

Updated: 2026-04-09T13:52:34.946Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-04-08T20:16:26.550

Modified: 2026-04-08T21:26:13.410

Link: CVE-2026-39863

cve-icon Redhat

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