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High severity7.5NVD Advisory· Published Apr 8, 2026· Updated Apr 15, 2026

CVE-2026-39863

CVE-2026-39863

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

3
  • Kamailio/Kamailio3 versions
    cpe:2.3:a:kamailio:kamailio:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:a:kamailio:kamailio:*:*:*:*:*:*:*:*range: <5.8.8
    • cpe:2.3:a:kamailio:kamailio:6.1.0:*:*:*:*:*:*:*
    • (no CPE)range: <6.1.1, <6.0.6, <5.8.8

Patches

Vulnerability mechanics

References

1

News mentions

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