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
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-284 CWE-918 |
| Vendor | coturn |
| Product | coturn |
| Published | Aug 11, 2026 |
| Last Updated | Aug 11, 2026 |
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Affected Versions
coturn / coturn
< 4.13.1
References
github.com: https://github.com/coturn/coturn/security/advisories/GHSA-2x4g-wx24-48m4 github.com: https://github.com/coturn/coturn/pull/1945 github.com: https://github.com/coturn/coturn/pull/1947 github.com: https://github.com/coturn/coturn/commit/cf4b4952de48510d38415b96300da5fc674bfdda github.com: https://github.com/coturn/coturn/commit/d49ee56aa9fe748af064853d5e430eec1ccc3cbc github.com: https://github.com/coturn/coturn/releases/tag/4.13.1