CVE-2026-39863

EUVD-2026-20616
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 14%
Affected Products (NVD)
VendorProductVersion
kamailiokamailio
𝑥
< 5.8.8
kamailiokamailio
6.0.0 ≤
𝑥
< 6.0.6
kamailiokamailio
6.1.0
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/kamailio/kamailio/security/advisories/GHSA-2wj4-f825-2h2f