CVE-2026-106804

Remote Host Field Overflow in Kamailio ims_qos_npn Causes Denial of Service

Published Nov 2, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
A stack-based buffer overflow exists in Kamailio v6.1.3 and v6.1.4 in the ims_qos_npn module. The w_rx_aar_register() function copies the attacker-controlled host field from the SIP `Via` header into a fixed 46-byte stack buffer without validating its length. An unauthenticated remote attacker can trigger the vulnerability with a crafted SIP `REGISTER` request, causing stack corruption and termination of the affected Kamailio instance, resulting in denial of service.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

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History
Type Values Removed Values Added
Title Remote Host Field Overflow in Kamailio ims_qos_npn Causes Denial of Service
Type Values Removed Values Added
Title Stack-based Buffer Overflow in Kamailio ims_qos_npn Module Causing DoS
Weaknesses CWE-119
Type Values Removed Values Added
First Time appeared Kamailio
Kamailio kamailio
Weaknesses CWE-120
CWE-121
CWE-20
Vendors & Products Kamailio
Kamailio kamailio
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

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

Type Values Removed Values Added
Title Stack-based Buffer Overflow in Kamailio ims_qos_npn Module Causing DoS
Weaknesses CWE-119
Type Values Removed Values Added
Description A stack-based buffer overflow exists in Kamailio v6.1.3 and v6.1.4 in the ims_qos_npn module. The w_rx_aar_register() function copies the attacker-controlled host field from the SIP `Via` header into a fixed 46-byte stack buffer without validating its length. An unauthenticated remote attacker can trigger the vulnerability with a crafted SIP `REGISTER` request, causing stack corruption and termination of the affected Kamailio instance, resulting in denial of service.
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Nov 2, 2026, 6:55 PM
Reserved
Oct 7, 2026, 12:00 AM
Status
Awaiting Analysis
Published
Nov 2, 2026, 5:17 PM
Modified
Nov 2, 2026, 7:34 PM