CVE-2026-39863

Kamailio Core: TCP Data Processing Vulnerability

State: Published
Severity: 7.5 High
Published: Apr 8, 2026
Updated: Apr 9, 2026
Reserved: Apr 7, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

Affected Products

Product	Versions
kamailiokamailio	< 5.8.8Affected >= 6.0.0, < 6.0.6Affected >= 6.1.0, < 6.1.1Affected

References

https://github.com/kamailio/kamailio/security/advisories/GHSA-2wj4-f825-2h2f

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