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CVE-2026-106803 Details

Description

A stack-based buffer overflow exists in Kamailio v6.1.3 and v6.1.4 in the ims_registrar_pcscf module. When processing a crafted application/reginfo+xml NOTIFY message, process_contact() copies an attacker-controlled port value from the alias parameter into a fixed 5-byte stack buffer without validating its length. An unauthenticated remote attacker can trigger stack corruption and terminate the P-CSCF process, resulting in denial of service.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/kamailio/kamailio/issues/4954	CISA-ADP
https://gist.github.com/hackeryounow/7d7ccc9ec501a5d8c9143b2e1bcc11cb	[email protected]
https://github.com/kamailio/kamailio/commit/21261436492f0014930e804e20586e3833bb91b9	[email protected]
https://github.com/kamailio/kamailio/issues/4954	[email protected]
https://github.com/kamailio/kamailio/pull/4958	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-121	Stack-based Buffer Overflow	CISA-ADP

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Nov 3, 2026	CVE Modified	CISA-ADP
Nov 2, 2026	New CVE Received	[email protected]