CVE-2026-73212

coturn peer-IP ACL canonicalization & scope bypass on the RFC 6062 TCP CONNECT relay path → internal-network SSRF and proven internal root RCE

Published: Aug 11, 2026Updated: Sep 9, 2026 Sources: CVE List NVDCWE-284

N/ACVSS

NVD MITRE

Description

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.1, good_peer_addr() in src/server/ns_turn_server.c uses ioa_addr_in_range() in src/client/ns_turn_ioaddr.c without canonicalizing IPv4-compatible, 6to4, and 64:ff9b::/96 NAT64 address forms, allowing an authenticated RFC 6062 TCP CONNECT relay client to bypass an IPv4 denied-peer-ip range when the Coturn host has a useful translation route. This issue is fixed in version 4.13.1.

No summary for this CVE yet.

Weaknesses

CWE-284 CWE-918

Affected Products

coturn

oss-project

coturnOn-prem

Networking Infrastructure / load-balancer-proxy

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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Attack Graph

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MITRE ATT&CK

2 techniques

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References

https://github.com/coturn/coturn/commit/cf4b4952de48510d38415b96300da5fc674bfdda

github.com

https://github.com/coturn/coturn/commit/d49ee56aa9fe748af064853d5e430eec1ccc3cbc

github.com

https://github.com/coturn/coturn/pull/1945

github.com

and 3 more references View all →

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