CVE-2026-39863: Kamailio Core: TCP Data Processing Vulnerability

Q: What is the severity of CVE-2026-39863?

CVE-2026-39863 has a high severity as it allows remote attackers to cause a denial of service through a process crash.

Q: How do I fix CVE-2026-39863?

To mitigate CVE-2026-39863, upgrade Kamailio to version 6.1.1, 6.0.6, or 5.8.8 or higher.

Q: What versions of Kamailio are affected by CVE-2026-39863?

CVE-2026-39863 affects Kamailio versions prior to 6.1.1, 6.0.6, and 5.8.8.

Q: What type of vulnerability is CVE-2026-39863?

CVE-2026-39863 is an out-of-bounds access vulnerability in the core of Kamailio.

Q: Can CVE-2026-39863 be exploited remotely?

Yes, CVE-2026-39863 can be exploited remotely by attackers to cause denial of service.

Published Apr 8, 2026

Updated

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.

Affected Software

4 affected components

kamailio Kamailio<6.1.1, <6.0.6, <5.8.8

kamailio Kamailio<5.8.8

kamailio Kamailio>=6.0.0<6.0.6

kamailio Kamailio=6.1.0

Event History

Apr 8, 2026

CVE Published

via MITRE·07:55 PM

Data Sourced

via MITRE·07:55 PM

DescriptionSeverityWeakness

Data Sourced

via NVD·08:16 PM

DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

What is the severity of CVE-2026-39863?

CVE-2026-39863 has a high severity as it allows remote attackers to cause a denial of service through a process crash.

How do I fix CVE-2026-39863?

To mitigate CVE-2026-39863, upgrade Kamailio to version 6.1.1, 6.0.6, or 5.8.8 or higher.

What versions of Kamailio are affected by CVE-2026-39863?

CVE-2026-39863 affects Kamailio versions prior to 6.1.1, 6.0.6, and 5.8.8.

What type of vulnerability is CVE-2026-39863?

CVE-2026-39863 is an out-of-bounds access vulnerability in the core of Kamailio.

Can CVE-2026-39863 be exploited remotely?

Yes, CVE-2026-39863 can be exploited remotely by attackers to cause denial of service.

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