Coturn up to 4.16.x Quota Accounting ns_turn_server.c shutdown_client_connection allocation of resources

Summaryinfo

A vulnerability was found in Coturn up to 4.16.x. It has been rated as problematic. The impacted element is the function shutdown_client_connection of the file src/server/ns_turn_server.c of the component Quota Accounting. Performing a manipulation results in allocation of resources. This vulnerability is known as CVE-2026-73216. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as problematic has been found in Coturn up to 4.16.x. This affects the function shutdown_client_connection of the file src/server/ns_turn_server.c of the component Quota Accounting. The manipulation with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. This is going to have an impact on integrity, and availability. The summary by CVE is:

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.17.0, shutdown_client_connection() in src/server/ns_turn_server.c prematurely calls dec_quota() and releases bandwidth accounting during the first-stage close of a mobility-enabled allocation while preserving the allocation, relay socket, session, and mobility ticket, allowing an authenticated client to bypass --user-quota and --total-quota and exhaust relay ports. This issue is fixed in version 4.17.0.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-73216 since 08/11/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 4.17.0 eliminates this vulnerability.

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Productinfo

Name

• Coturn

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 4.12
• 4.13
• 4.14
• 4.15
• 4.16

Website

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

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