Kamailio 6.1.3/6.1.4 ims_qos_npn w_rx_aar_register host stack-based overflow

Summaryinfo

A vulnerability described as problematic has been identified in Kamailio 6.1.3/6.1.4. This vulnerability affects the function w_rx_aar_register of the component ims_qos_npn. Such manipulation of the argument host leads to stack-based overflow. This vulnerability is listed as CVE-2026-106804. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Kamailio 6.1.3/6.1.4. It has been rated as problematic. Affected by this issue is the function w_rx_aar_register of the component ims_qos_npn. The manipulation of the argument host with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-106804 since 10/07/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/02/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• Kamailio

Version

• 6.1.3
• 6.1.4

Website

• Product: https://github.com/kamailio/kamailio/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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