CVE-2026-73212

EUVD-2026-56789
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
GitHub_MCNA
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Base Score
CVSS 3.x
EPSS Score
Percentile: 42.91%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).
VendorProductVersionSource
coturn_projectcoturn
𝑥
< 4.13.1
CNA
Debian logo
Debian Releases
Debian Product
Codename
coturn
bookworm
vulnerable
forky
4.18.0-1
fixed
sid
4.18.0-1
fixed
trixie
vulnerable
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
coturn
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
xenial
needs-triage
Common Weakness Enumeration
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