{"apiVersion":"1.0","identifier":"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.","publishedAt":"2026-08-19T21:17:28","lastModifiedAt":"2026-08-20T20:17:45","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-68553","cvssScore":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","epssProbability":0.00279,"riskScore":0.73,"affectedProduct":"coturn","affectedVersions":"<4.13.0","vulnerabilityType":"Critical software","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-68553","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-68553","en":"https://www.redsauce.net/en/cves/CVE-2026-68553","fr":"https://www.redsauce.net/fr/cves/CVE-2026-68553","pt":"https://www.redsauce.net/pt/cves/CVE-2026-68553","de":"https://www.redsauce.net/de/cves/CVE-2026-68553","sk":"https://www.redsauce.net/sk/cves/CVE-2026-68553","el":"https://www.redsauce.net/el/cves/CVE-2026-68553"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-68553"}}