VDB
CVE-2026-68555
CVE-2026-68555
PUBLISHED
CVSS 6.5 MEDIUM
Reported by GitHub_M · Published August 19, 2026
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.
Risk Scores
CVSS 3.1
6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| coturn | coturn | >= 4.15.0, < 4.16.0 |
| coturn | coturn | >= 4.15.0, < 4.16.0, >= 4.15.0, < 4.16.0 |
Timeline
- Aug 19, 2026 CVE Published
- Aug 20, 2026 Coalition ESS Score
- Aug 24, 2026 EPSS Score
- Aug 28, 2026 EPSS Score
- Sep 2, 2026 EPSS Score
- Sep 2, 2026 Security Advisory
- Sep 6, 2026 EPSS Score
- Sep 9, 2026 EPSS Score
- Sep 9, 2026 CVE Updated
- Sep 10, 2026 EPSS Score
- Sep 12, 2026 EPSS Score
- Sep 16, 2026 EPSS Score
References
- https://github.com/coturn/coturn/security/advisories/GHSA-hpq3-g7x4-h7xx x_refsource_CONFIRM
- https://github.com/coturn/coturn/commit/a97f1924bb435bec49d6d91ae01fa2487c2e1bf7 x_refsource_MISC
- https://github.com/coturn/coturn/releases/tag/4.16.0 x_refsource_MISC