CVE-2026-73214

Name	CVE-2026-73214
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1144385

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
coturn (PTS)	bullseye	4.5.2-3	vulnerable
	bookworm	4.6.1-1	vulnerable
	trixie	4.6.1-2	vulnerable
	forky, sid	4.15.0-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
coturn	source	(unstable)	(unfixed)			1144385

Notes

https://github.com/coturn/coturn/security/advisories/GHSA-5x2p-4vqj-f6m4
https://github.com/coturn/coturn/pull/2003
Fixed by: https://github.com/coturn/coturn/commit/beb4de9dcb6a475129595b943c9a34264420df09 (4.16.0)
https://github.com/coturn/coturn/pull/2012
Fixed by: https://github.com/coturn/coturn/commit/37e13d1d60af8f1422c01b5e9f1c6bc355d03b85 (4.16.0)