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

Quick assessment

Affected
coturn coturn
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Coturn是Coturn组织开源的一款TURN(VoIP媒体业务NAT穿越服务器和网关)和STUN(用户数据报协议简单穿越网络地址转换器)Server的实现。 Coturn 4.17.0之前版本存在资源管理错误漏洞，该漏洞源于shutdown_client_connection()过早调用dec_quota()并释放带宽计费，可能导致已认证客户端绕过用户配额和总配额，耗尽中继端口。

CVSS 6.5 · Medium EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1135 · Network Share Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
coturn coturn < 4.17.0 affected
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I. Basic Information for CVE-2026-73216

Vulnerability Information
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Vulnerability Title
coturn: mobility disconnects bypass allocation quotas and exhaust relay capacity
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Coturn 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Coturn是Coturn组织开源的一款TURN(VoIP媒体业务NAT穿越服务器和网关)和STUN(用户数据报协议简单穿越网络地址转换器)Server的实现。 Coturn 4.17.0之前版本存在资源管理错误漏洞，该漏洞源于shutdown_client_connection()过早调用dec_quota()并释放带宽计费，可能导致已认证客户端绕过用户配额和总配额，耗尽中继端口。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
coturn coturn < 4.17.0 -

II. Public POCs for CVE-2026-73216

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III. Intelligence Information for CVE-2026-73216

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Patches & Fixes for CVE-2026-73216 (1)

Vendor Advisories for CVE-2026-73216 (1)

Vendor Pages for CVE-2026-73216 (1)

Same Patch Batch · coturn · 2026-08-11 · 5 CVEs total

CVE-2026-73214 8.2 HIGH coturn allocates a full per-peer SSL/session before verifying the DTLS cookie, enabling so
CVE-2026-73215 7.1 HIGH The coturn server can end in a state where it does not accept more requests with "even-por
CVE-2026-73212 5.8 MEDIUM coturn peer-IP ACL canonicalization & scope bypass on the RFC 6062 TCP CONNECT relay path
CVE-2026-73213 5.8 MEDIUM Coturn: `addr_less_eq()` does a component-wise IPv6 comparison instead of a lexicographic

IV. Related Vulnerabilities

Same product: coturn
Same vendor: coturn
Same weakness: CWE-400

V. Comments for CVE-2026-73216

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