CVE-2026-73214
coturn allocates a full per-peer SSL/session before verifying the DTLS cookie, enabling source-spoofing/botnet state-exhaustion DoS
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 4.16.0, dtls_server_input_handler() and create_new_connected_udp_socket() in src/apps/relay/dtls_listener.c retain OpenSSL dtls1_reassemble_fragment() state for a 35-byte fragmented ClientHello declaring a 650,000-byte handshake before cookie validation, allowing an unauthenticated remote sender using fresh UDP tuples to exhaust memory without TURN credentials, a completed handshake, a valid cookie, or source spoofing. This issue is fixed in version 4.16.0.
| CWE | CWE-400 CWE-770 |
| Vendor | coturn |
| Product | coturn |
| Published | Aug 11, 2026 |
Stay Ahead of the Next One
Get instant alerts for coturn coturn
Be the first to know when new unknown vulnerabilities affecting coturn coturn are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
Affected Versions
coturn / coturn
< 4.16.0
References
github.com: https://github.com/coturn/coturn/security/advisories/GHSA-5x2p-4vqj-f6m4 github.com: https://github.com/coturn/coturn/pull/2003 github.com: https://github.com/coturn/coturn/pull/2012 github.com: https://github.com/coturn/coturn/commit/37e13d1d60af8f1422c01b5e9f1c6bc355d03b85 github.com: https://github.com/coturn/coturn/commit/beb4de9dcb6a475129595b943c9a34264420df09 github.com: https://github.com/coturn/coturn/releases/tag/4.16.0