Security Vulnerability in Coturn TURN and STUN Server Affects Bandwidth Accounting
CVE-2026-73216

6.5MEDIUM

Key Information:

Vendor

Coturn

Status
Coturn
Vendor
CVE Published:
11 August 2026

What is CVE-2026-73216?

A vulnerability in Coturn, an open-source implementation of TURN and STUN server, allows authenticated clients to bypass user and total quotas due to a flaw in the shutdown_client_connection() function. This issue arises when bandwidth accounting is improperly released during the first-stage close of a mobility-enabled allocation. As a result, the allocation, relay socket, session, and mobility ticket remain intact, enabling clients to exhaust relay ports. The issue has been addressed in Coturn version 4.17.0.

Affected Version(s)

coturn < 4.17.0

References

https://github.com/coturn/coturn/security/advisories/GHSA...
x_refsource_CONFIRM
https://github.com/coturn/coturn/commit/3c5b2615fd405c4e7...
x_refsource_MISC
https://github.com/coturn/coturn/releases/tag/4.17.0
x_refsource_MISC

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.