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Vulnerability · Published Aug 11, 2026 · Assigned by GitHub_M

CVE-2026-73216coturn: mobility disconnects bypass allocation quotas and exhaust relay capacity

Medium 6.5

In plain English

A medium-severity uncontrolled resource consumption in coturn from coturn. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.6%top 52.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12coturnno fix listedDEBIAN-CVE-2026-73216
Debian:13coturnno fix listedDEBIAN-CVE-2026-73216
Debian:14coturn4.18.0-1DEBIAN-CVE-2026-73216
Ubuntu:22.04:LTScoturnno fix listedUBUNTU-CVE-2026-73216
Ubuntu:24.04:LTScoturnno fix listedUBUNTU-CVE-2026-73216
Ubuntu:26.04:LTScoturnno fix listedUBUNTU-CVE-2026-73216
Ubuntu:26.10coturnno fix listedUBUNTU-CVE-2026-73216

Affected products (as reported)

VendorProductVersions
coturn coturn < 4.17.0

Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References