Out-of-Bounds Access Vulnerability in Kamailio SIP Signaling Server
CVE-2026-39863

7.5HIGH

Key Information:

Vendor

Kamailio

Status
Kamailio
Vendor
CVE Published:
8 April 2026

What is CVE-2026-39863?

An out-of-bounds access vulnerability in Kamailio SIP Signaling Server allows remote attackers to trigger a denial of service scenario through specially crafted data packets sent over TCP. This issue specifically affects Kamailio instances configured with TCP or TLS listeners, which could result in the server process crashing. The vulnerability has been addressed in the updates of versions 5.1.1, 6.0.6, and 5.8.8, mitigating the associated risks.

Affected Version(s)

kamailio < 5.8.8 < 5.8.8

kamailio >= 6.0.0, < 6.0.6 < 6.0.0, 6.0.6

kamailio >= 6.1.0, < 6.1.1 < 6.1.0, 6.1.1

References

https://github.com/kamailio/kamailio/security/advisories/...
x_refsource_CONFIRM

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.