coturn: Chained mobility resumes allow authenticated remote memory exhaustion

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68555
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-19 21:17:28 UTC
Updated2026-08-21 19:17:43 UTC
DescriptionCoturn 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 And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.003080000 probability, percentile 0.235970000 (date 2026-08-23)

Problem Types: CWE-400 | CWE-400 CWE-400: Uncontrolled Resource Consumption

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Coturn Coturn affected >= 4.15.0, < 4.16.0 Not specified

References

ReferenceSourceLinkTags
github.com/coturn/coturn/releases/tag/4.16.0 [email protected] github.com
github.com/coturn/coturn/security/advisories/GHSA-hpq3-g7x4-h7xx 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/coturn/coturn/commit/a97f1924bb435bec49d6d91ae01fa2487c2e1bf7 [email protected] github.com
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