{"id":"CVE-2026-68553","aliases":["DEBIAN-CVE-2026-68553","EUVD-2026-63077","GHSA-4g7c-p5wg-j4hp","UBUNTU-CVE-2026-68553","openSUSE-SU-2026:11617-1"],"status":"published","title":"Coturn: Format String Injection via TURN USERNAME/REALM into hiredis Redis Command","description":"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.","severity":{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.0048,"percentile":0.41906,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-134"],"published":"2026-08-19T20:37:42Z","modified":"2026-10-28T11:01:24Z","fixes":[{"ecosystem":"Debian:14","package":"coturn","fixed_in":["4.14.0-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.12.0-1","4.14.0-1","4.15.0-1","4.18.0-1","4.6.1-1","4.6.1-2"]},{"source":"osv","ecosystem":"Debian:13","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.12.0-1","4.14.0-1","4.15.0-1","4.18.0-1","4.6.1-2"]},{"source":"osv","ecosystem":"Debian:14","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.0-1"}]}],"versions":["4.12.0-1","4.6.1-2"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.5.4-2","4.5.0.2-3","4.5.0.3-1","4.5.0.3-1build1","4.5.0.3-1ubuntu0.2","4.5.0.3-1ubuntu0.3","4.5.0.3-1ubuntu0.4"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.0.6-1ubuntu2","4.5.0.7-1ubuntu1","4.5.0.7-1ubuntu2","4.5.0.7-1ubuntu2.18.04.1","4.5.0.7-1ubuntu2.18.04.2","4.5.0.7-1ubuntu2.18.04.3"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.1.1-1.1build1","4.5.1.1-1.1build2","4.5.1.1-1.1ubuntu0.20.04.1","4.5.1.1-1.1ubuntu0.20.04.2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.2-3","4.5.2-3.1~ubuntu22.04.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.6.1-1build1","4.6.1-1build2","4.6.1-1build3","4.6.1-1build4"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.6.1-2build2","4.12.0-1","4.14.0-1","4.15.0-1","4.18.0-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.6.1-2build1","4.6.1-2build2"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.17.2-1.1"}]}],"bundled":17}],"products":[{"vendor":"coturn","product":"coturn"}],"references":[{"url":"https://github.com/coturn/coturn/security/advisories/GHSA-4g7c-p5wg-j4hp","tags":["x_refsource_CONFIRM","exploit","advisory","report"]},{"url":"https://github.com/coturn/coturn/commit/8fa38032bb4751e11e072d65a8eca3c06c950979","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/coturn/coturn/releases/tag/4.13.0","tags":["x_refsource_MISC","web","report"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68553.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68553","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-68553","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-68553","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-68553","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-40613","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-43915","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-43994","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-53448","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-53449","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-53450","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-62959","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-65981","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-68552","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-68553","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-68554","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-68555","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73212","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73213","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73214","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73215","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73216","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-68553","title":"Coturn: Format String Injection via TURN USERNAME/REALM into hiredis Redis Command","description":"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.","status":"published","published":"2026-08-19T20:37:42.319Z","modified":"2026-08-20T19:48:45.809Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-134"],"updated_at":"2026-11-02T13:45:59.110885Z"}],"euvd":[{"id":"EUVD-2026-63077","description":"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.","status":"published","published":"2026-08-19T20:37:42Z","modified":"2026-08-20T19:48:45Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T18:01:38.846525Z"}],"nvd":[{"id":"CVE-2026-68553","description":"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.","status":"published","published":"2026-08-19T21:17:28.163Z","modified":"2026-10-26T10:10:00.14Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-134"],"updated_at":"2026-11-02T14:12:39.962615Z"}],"osv":[{"id":"CVE-2026-68553","title":"Coturn: Format String Injection via TURN USERNAME/REALM into hiredis Redis Command","description":"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.","status":"published","published":"2026-08-19T20:37:42.319Z","modified":"2026-10-28T11:01:24.614206212Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"high"}],"cwes":["CWE-134"],"updated_at":"2026-11-02T15:45:14.808935Z"},{"id":"DEBIAN-CVE-2026-68553","description":"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.","status":"published","published":"2026-08-19T21:17:28.163Z","modified":"2026-10-27T09:47:42.838394768Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:46:02.094661Z"},{"id":"UBUNTU-CVE-2026-68553","description":"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.","status":"published","published":"2026-08-19T21:17:00Z","modified":"2026-10-17T13:00:42.338676592Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:56:57.159276Z"},{"id":"openSUSE-SU-2026:11617-1","title":"coturn-4.17.2-1.1 on GA media","description":"These are all security issues fixed in the coturn-4.17.2-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-08-27T00:00:00Z","modified":"2026-08-28T18:23:08.654818419Z","updated_at":"2026-11-02T16:58:39.516824Z"}]}}