Vulnerability · Published Nov 2, 2026 · Assigned by mitre
CVE-2026-106804
High 7.5
In plain English
A high-severity stack buffer overflow in the kamailio package (Ubuntu). Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities).
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | kamailio | no fix listed | UBUNTU-CVE-2026-106804 |
| Ubuntu:24.04:LTS | kamailio | no fix listed | UBUNTU-CVE-2026-106804 |
| Ubuntu:26.04:LTS | kamailio | no fix listed | UBUNTU-CVE-2026-106804 |
| Ubuntu:26.10 | kamailio | no fix listed | UBUNTU-CVE-2026-106804 |
Affected products (as reported)
Weakness: CWE-121, CWE-120, CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H