CVE-2026-106803 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 atta...

CriticalCVSS 9.8 EPSS 0.51%

Published: 2026-11-02 15:09 (approximate time: when CVE Radar first recorded it)
Updated: 2026-11-03 16:17
Exploit status: No public exploit known

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.

Affected products

Product	Affected versions	Fixed in
ubuntu/kamailio(Ubuntu:22.04)	All versions	No fix listed
ubuntu/kamailio(Ubuntu:24.04)	All versions	No fix listed
ubuntu/kamailio(Ubuntu:26.04)	All versions	No fix listed
ubuntu/kamailio(Ubuntu:26.10)	All versions	No fix listed

References

CVSS v3.1

9.8 Critical

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

All scores (2)

v3.1 9.8 · cisa-adp
v3.1 9.8 · ubuntu

Weakness & likelihood

EPSS (exploitation probability, 30 days): 0.51% (percentile 43.7)
CWE: CWE-121 Stack-based Buffer Overflow

Public exploit references

Metadata only. CVERadar never hosts or runs exploit code.

No public exploit references known.