---
title: "CVE-2026-106804: Kamailio - Buffer Overflow"
description: "Kamailio v6.1.3 and v6.1.4 contain a stack overflow caused by unchecked copying of the host field from SIP Via header in ims_qos_npn module, letting unauthenticated remote attackers cause denial of service via crafted REGISTER request."
url: https://panop.io/threat-heartbeat/CVE-2026-106804/
---

# CVE-2026-106804 Kamailio - Buffer Overflow

Kamailio v6.1.3 and v6.1.4 contain a stack overflow caused by unchecked copying of the host field from SIP Via header in ims\_qos\_npn module, letting unauthenticated remote attackers cause denial of service via crafted REGISTER request.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-106804)

## Details

Type

Buffer Overflow

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

2 November 2026

Updated

3 November 2026

Weakness

[CWE-20](https://cwe.mitre.org/data/definitions/20.html)

## Vendor fix

Update to a version later than 6.1.4 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-106804](https://nvd.nist.gov/vuln/detail/CVE-2026-106804)
- [https://gist.github.com/hackeryounow/f5af75502ea6df600428c46bb9bbf39e](https://gist.github.com/hackeryounow/f5af75502ea6df600428c46bb9bbf39e)
- [https://github.com/kamailio/kamailio/issues/4953](https://github.com/kamailio/kamailio/issues/4953)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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