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Public proof of conceptFix available

CVE-2026-73216

A public proof of concept exists; no exploitation attested.

  • Published2026-08-11
  • WeaknessCWE-400

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.17.0, shutdown_client_connection() in src/server/ns_turn_server.c prematurely calls dec_quota() and releases bandwidth accounting during the first-stage close of a mobility-enabled allocation while preserving the allocation, relay socket, session, and mobility ticket, allowing an authenticated client to bypass --user-quota and --total-quota and exhaust relay ports. This issue is fixed in version 4.17.0.

Timeline

dates in UTC
  1. 2026-08-1118:18CVE publishedNVD

Versions per branch

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • coturn
    Affected
    • = < 4.17.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-08-11

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • coturnUbuntu:26.10all versions · no fixed version listed
  • coturnUbuntu:26.04:LTSall versions · no fixed version listed
  • coturnUbuntu:24.04:LTSall versions · no fixed version listed
  • coturnUbuntu:22.04:LTSall versions · no fixed version listed
  • coturnUbuntu:20.04:LTSall versions · no fixed version listed
  • coturnUbuntu:18.04:LTSall versions · no fixed version listed
  • coturnUbuntu:16.04:LTSall versions · no fixed version listed
  • coturnopenSUSE:Tumbleweedall versions · fixed in 4.17.2-1.1

4 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-73216 Red Hat Product Security

    coturn: coturn: Authenticated client can exhaust relay capacity via quota bypass

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionpoc2026-08-11
  • CNACVSS 3.16.5known since 2026-10-23
  • CNAweakness (CWE)CWE-400known since 2026-10-23
  • FIRST EPSSEPSS score0.6 %2026-11-08
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published
2026-08-11
Last Modified
2026-09-09
NVD status
Deferred

Frequently asked questions

What is CVE-2026-73216?

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.17.0, shutdown_client_connection() in src/server/ns_turn_server.c prematurely calls dec_quota() and releases bandwidth accounting during the first-stage close of a mobility-enabled allocation while preserving the allocation, relay socket, session, and mobility ticket, allowing an authenticated client to bypass --user-quota and --total-quota and exhaust relay ports. This issue is fixed in version 4.17.0.

Is CVE-2026-73216 actively exploited?

A proof-of-concept exploit exists for CVE-2026-73216, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-73216?

CVE-2026-73216 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record