Unbounded Session Vulnerability in Coturn TURN/STUN Server by Coturn
CVE-2026-68555

6.5MEDIUM

Key Information:

Vendor

Coturn

Status
Coturn
Vendor
CVE Published:
19 August 2026

What is CVE-2026-68555?

A security flaw in Coturn version 4.15.0 allows an authenticated TURN user to create unbounded server-side sessions by repeatedly resuming an allocation without completing the handoff when the server's mobility feature is enabled. The bug arises due to a failure to appropriately handle allocation timeouts and pending sessions, leading to potential server memory exhaustion even with strict user quotas in place. This issue was addressed in version 4.16.0.

Affected Version(s)

coturn >= 4.15.0, < 4.16.0

References

https://github.com/coturn/coturn/security/advisories/GHSA...
x_refsource_CONFIRM
https://github.com/coturn/coturn/commit/a97f1924bb435bec4...
x_refsource_MISC
https://github.com/coturn/coturn/releases/tag/4.16.0
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

.