What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.8 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-11 · updated 2026-09-09
• Weakness: CWE-284

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.

Affected products

• coturn: before 4.13.1

References

• https://github.com/coturn/coturn/commit/cf4b4952de48510d38415b96300da5fc674bfdda
• https://github.com/coturn/coturn/commit/d49ee56aa9fe748af064853d5e430eec1ccc3cbc
• https://github.com/coturn/coturn/pull/1945
• https://github.com/coturn/coturn/pull/1947
• https://github.com/coturn/coturn/releases/tag/4.13.1
• https://github.com/coturn/coturn/security/advisories/GHSA-2x4g-wx24-48m4

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