# CVE-2026-106804: CVE-2026-106804

Status: published. Published: 2026-11-02. Updated: 2026-11-02.

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 remediation reported in collected sources

## Affected products and versions

- n/a / n/a: Version not specified (affected). Source: CNA: mitre

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: ADP: CISA-ADP

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation poc; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-121, CWE-120, CWE-20

## Exploit evidence

- exploit: https://github.com/kamailio/kamailio/issues/4953 (ADP: CISA-ADP)

## References

- https://github.com/kamailio/kamailio/issues/4953 (CNA: mitre)

- https://gist.github.com/hackeryounow/f5af75502ea6df600428c46bb9bbf39e (CNA: mitre)

- https://github.com/kamailio/kamailio/issues/4953 (ADP: CISA-ADP; exploit)

- https://gist.github.com/hackeryounow/f5af75502ea6df600428c46bb9bbf39e (cve@mitre.org)

- https://github.com/kamailio/kamailio/issues/4953 (cve@mitre.org)

## Provenance

- CNA: mitre: https://www.cve.org/CVERecord?id=CVE-2026-106804; retrieved 2026-11-02; source updated 2026-11-02

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-106804; retrieved 2026-11-02; source updated 2026-11-02

Revision: 5358785bb42f6ccf50a3b21402baf61b898bb072cfe4d36f5dca68a897fa7008

Canonical: https://y2.dev/cve/CVE-2026-106804

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