coturn: Coturn is a free open source implementation of TURN and STUN Server
CVE-2026-68553 is fixed in coturn on 1 platform by DEBIAN-CVE-2026-68553 (version 4.14.0-1), released August 21, 2026. It is not reported as exploited. Patch Radar priority: High.
Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.0, an authenticated TURN user can place printf-style format specifiers in the STUN USERNAME or REALM attribute, which passes is_secure_string() validation and is embedded into Redis keys at nine call sites in src/apps/relay/ns_ioalib_engine_impl.c. send_message_to_redis() in src/apps/relay/hiredis_libevent2.c then passes the attacker-controlled key as the format argument to redisAsyncCommand() while supplying only one variadic value, causing hiredis redisvFormatCommand() to read past the va_list. Exploitation can crash the coturn process and terminate active TURN sessions or disclose stack memory into Redis. This issue is fixed in version 4.13.0.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| coturn · Debian 14 | 4.14.0-1 | DEBIAN-CVE-2026-68553 | Aug 21, 2026 |
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