CVE-2026-73212 MEDIUM

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

Vendor Coturn

Product coturn

Weakness CWE-284

Published August 11, 2026

Last update August 11, 2026

View on NVD All CVEs

CVSS base score

5.8/10

Attack vector Network

Attack complexity Low

Privileges required Low

User interaction None

Confidentiality —

Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

August 11, 2026 CVE published

August 11, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-73212 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/284.html AskarLabs — CWE-284 write-up Improper Access Control

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