Coturn up to 4.16.x Port Allocation turn_ports.c turnports_allocate_even allocation of resources

Summaryinfo

A vulnerability was found in Coturn up to 4.16.x. It has been declared as critical. The affected element is the function turnports_allocate_even of the file src/apps/relay/turn_ports.c of the component Port Allocation. Such manipulation leads to allocation of resources. This vulnerability is traded as CVE-2026-73215. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Coturn up to 4.16.x. It has been rated as critical. Affected by this issue is the function turnports_allocate_even of the file src/apps/relay/turn_ports.c of the component Port Allocation. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to 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. Impacted is availability. CVE summarizes:

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.17.0, turnports_allocate_even() in src/apps/relay/turn_ports.c marks the unused odd sibling port as TPS_TAKEN_ODD for an EVEN-PORT Allocate request with reservation bit R=0 even though no RTCP socket will release it, allowing an authenticated client to permanently exhaust the relay port pool and cause subsequent allocations to fail with STUN error 508. This issue is fixed in version 4.17.0.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-73215 since 08/11/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

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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