CVE-2026-73216

Name	CVE-2026-73216
Description	Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.17.0, shutdown_client_connection() in src/server/ns_turn_server.c prematurely calls dec_quota() and releases bandwidth accounting during the first-stage close of a mobility-enabled allocation while preserving the allocation, relay socket, session, and mobility ticket, allowing an authenticated client to bypass --user-quota and --total-quota and exhaust relay ports. This issue is fixed in version 4.17.0.
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-f6hc-79w3-p8pq
Fixed by: https://github.com/coturn/coturn/commit/3c5b2615fd405c4e7c5bf3fbeef895c94a90671b (4.17.0)