CVE-2026-68552

Name	CVE-2026-68552
Description	Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.15.0, an unauthenticated remote client can send a STUN message over TCP or TLS with a body-length field from 65520 through 65532, causing the uint16_t len variable in stun_get_message_len_str() in src/client/ns_turn_msg.c to wrap when STUN_HEADER_LENGTH is added. The framing layer then consumes only 4 through 16 bytes, treats the remaining bytes as another message, desynchronizes the stream parser, and drops the attacking client's connection. Other clients and the server process are not affected. This issue is fixed in version 4.15.0.
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)

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	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
coturn	source	(unstable)	4.15.0-1

Notes

https://github.com/coturn/coturn/security/advisories/GHSA-m562-mf7x-q7rr
https://github.com/coturn/coturn/pull/1964
Fixed by: https://github.com/coturn/coturn/commit/ed32e1fb6c843f9cf9a28d91c541dfbf40874f25 (4.15.0)