CVE-2026-73214

8.2 highEPSS 0.6%

High (8.2). EPSS 0.6% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

8.2 high

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

EPSS: 0.6% chance of exploitation in the next 30 days; higher than 47% of CVEs (scores of 2026-10-31)
CWEs: CWE-400, CWE-770
Published: 2026-08-11
Modified: 2026-09-09
Record from: the NVD, synced 2026-10-19

References

https://github.com/coturn/coturn/commit/37e13d1d60af8f1422c01b5e9f1c6bc355d03b85
https://github.com/coturn/coturn/commit/beb4de9dcb6a475129595b943c9a34264420df09
https://github.com/coturn/coturn/pull/2003
https://github.com/coturn/coturn/pull/2012
https://github.com/coturn/coturn/releases/tag/4.16.0

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