CVE-2026-73214

coturn allocates a full per-peer SSL/session before verifying the DTLS cookie, enabling source-spoofing/botnet state-exhaustion DoS

Published: Aug 11, 2026Updated: Sep 9, 2026 Sources: CVE List NVDCWE-400

N/ACVSS

NVD MITRE

Description

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.

No summary for this CVE yet.

Weaknesses

CWE-400 CWE-770

Affected Products

coturn

oss-project

coturnOn-prem

Networking Infrastructure / load-balancer-proxy

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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References

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

and 3 more references View all →

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