Bug 2514248 (CVE-2026-73216)

Summary: CVE-2026-73216 coturn: coturn: Authenticated client can exhaust relay capacity via quota bypass
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in coturn. An authenticated client can exploit a vulnerability in the `shutdown_client_connection()` function, which prematurely releases bandwidth accounting during the first stage of closing a mobility-enabled allocation. This allows the client to bypass user and total quotas, leading to the exhaustion of relay ports and a Denial of Service (DoS) condition.
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Description OSIDB Bzimport 2026-08-11 18:01:40 UTC 
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.