CVE-2026-73212

EUVD-2026-56789

11.08.2026, 18:18

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
GitHub_M	CNA	5.8 MEDIUM	NETWORK	LOW	LOW	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

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources.

Vendor	Product	Version	Source
coturn_project	coturn	𝑥 < 4.13.1	CNA

Debian Releases

Debian Product

Codename

coturn

bookworm	vulnerable
bullseye	vulnerable
forky	4.15.0-1 fixed
sid	4.15.0-1 fixed
trixie	vulnerable

Common Weakness Enumeration

CWE-284 - Improper Access Control
The software does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

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