CVE-2026-68555Public exploitNetwork attack vector

Memory exhaustion via chained mobility resumes

Published Aug 19, 2026 · Updated Aug 19, 2026

Denial of service in coturn 4.15.0 allows remote authenticated users to exhaust server memory via repeated mobility resumes. In src/server/ns_turn_server.c, mobile_begin_transition() disarms each new pending session's allocation timeout and overwrites the allocation's lone mobile_pending_resume link, and the fix shows superseded pending sessions were left unreachable by cleanup and stayed allocated indefinitely. Only deployments that enable --mobility are exposed, but one valid TURN account can bypass the intended one-allocation quota and degrade or terminate the server process.

CVSS severity6.5
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in coturn 4.15.0 allows remote authenticated users to exhaust server memory via repeated mobility resumes. In src/server/ns_turn_server.c, mobile_begin_transition() disarms each new pending session's allocation timeout and overwrites the allocation's lone mobile_pending_resume link, and the fix shows superseded pending sessions were left unreachable by cleanup and stayed allocated indefinitely. Only deployments that enable --mobility are exposed, but one valid TURN account can bypass the intended one-allocation quota and degrade or terminate the server process.

The record

CVE
CVE-2026-68555
Published
Aug 19, 2026
Updated
Aug 19, 2026
Vendor
coturn
Product
coturn
Classifications
CWE-400, T1499.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 4.15.0, < 4.16.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

coturn · coturnversion=>= 4.15.0, < 4.16.0

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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