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.
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Fixes

Solution

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Workaround

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History

Tue, 03 Nov 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 02 Nov 2026 19:30:00 +0000

Type Values Removed Values Added
First Time appeared Kamailio
Kamailio kamailio
Vendors & Products Kamailio
Kamailio kamailio

Mon, 02 Nov 2026 18:45:00 +0000

Type Values Removed Values Added
Title Stack‑Based Buffer Overflow in Kamailio ims_registrar_pcscf Module Allowing Denial of Service
Weaknesses CWE-121

Mon, 02 Nov 2026 17:15:00 +0000

Type Values Removed Values Added
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.
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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-11-03T13:33:16.962Z

Reserved: 2026-10-07T00:00:00.000Z

Link: CVE-2026-106803

cve-icon Vulnrichment

Updated: 2026-11-03T13:33:12.215Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-11-02T17:17:33.270

Modified: 2026-11-03T14:17:17.387

Link: CVE-2026-106803

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-02T19:15:16Z

Weaknesses