CVE-2026-73214CWE-400CWE-770denial-of-service

CVE-2026-73214

published August 11, 2026

CVSS
8.2
EPSS
1%
Percentile
46.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
8.2 · NONE
CVSS v4.0
Not supplied
EPSS
0.00577 · 46.8th percentile
Weaknesses
CWE-400 · Uncontrolled Resource Consumption; CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-08-11T22:18Z
References (6)
https://github.com/coturn/coturn/commit/37e13d1d60af8f1422c01b5e9f1c6bc355d03b85 · [email protected]https://github.com/coturn/coturn/commit/beb4de9dcb6a475129595b943c9a34264420df09 · [email protected]https://github.com/coturn/coturn/pull/2003 · [email protected]https://github.com/coturn/coturn/pull/2012 · [email protected]https://github.com/coturn/coturn/releases/tag/4.16.0 · [email protected]https://github.com/coturn/coturn/security/advisories/GHSA-5x2p-4vqj-f6m4 · [email protected]
EPSS history
Timeline
  • 11 AUG 17:34Z
    coturn allocates a full per-peer SSL/session before verifying the DTLS cookie, enabling source-spoofing/botnet state-exhaustion DoS
    cvelistv5