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Vulnerability · Published Aug 19, 2026 · Assigned by GitHub_M

CVE-2026-68555coturn: Chained mobility resumes allow authenticated remote memory exhaustion

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 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.5%top 55.0% 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. In 4.15.0, an authenticated TURN user can repeatedly resume one allocation from fresh UDP 5-tuples without completing a handoff when the server enables --mobility. mobile_begin_transition() in src/server/ns_turn_server.c disarms each new session's allocation timeout and overwrites the allocation's single mobile_pending_resume link, leaving earlier pending sessions unreachable by the cleanup path, while copy_auth_parameters() ignores inc_quota() failure. The attacker can therefore retain unbounded server-side sessions and exhaust process memory even when --user-quota=1 is configured. This issue is fixed in version 4.16.0.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12coturnno fix listedDEBIAN-CVE-2026-68555
Debian:13coturnno fix listedDEBIAN-CVE-2026-68555
Debian:14coturn4.18.0-1DEBIAN-CVE-2026-68555
Ubuntu:22.04:LTScoturnno fix listedUBUNTU-CVE-2026-68555
Ubuntu:24.04:LTScoturnno fix listedUBUNTU-CVE-2026-68555
Ubuntu:26.04:LTScoturnno fix listedUBUNTU-CVE-2026-68555
Ubuntu:26.10coturnno fix listedUBUNTU-CVE-2026-68555

Affected products (as reported)

VendorProductVersions
coturn coturn >= 4.15.0, < 4.16.0

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

References