{"api_version":"1","generated_at":"2026-08-22T02:57:02+00:00","cve":"CVE-2026-68553","urls":{"html":"https://cve.report/CVE-2026-68553","api":"https://cve.report/api/cve/CVE-2026-68553.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-68553","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-68553"},"summary":{"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.","state":"PUBLISHED","assigner":"GitHub_M","published_at":"2026-08-19 21:17:28","updated_at":"2026-08-20 20:17:45"},"problem_types":["CWE-134","CWE-134 CWE-134: Use of Externally-Controlled Format String"],"metrics":[{"version":"3.1","source":"security-advisories@github.com","type":"Secondary","score":"7.1","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.1","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://github.com/coturn/coturn/releases/tag/4.13.0","name":"https://github.com/coturn/coturn/releases/tag/4.13.0","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/coturn/coturn/security/advisories/GHSA-4g7c-p5wg-j4hp","name":"https://github.com/coturn/coturn/security/advisories/GHSA-4g7c-p5wg-j4hp","refsource":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/coturn/coturn/commit/8fa38032bb4751e11e072d65a8eca3c06c950979","name":"https://github.com/coturn/coturn/commit/8fa38032bb4751e11e072d65a8eca3c06c950979","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-68553","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68553","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"coturn","product":"coturn","version":"affected < 4.13.0","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"68553","cve":"CVE-2026-68553","epss":"0.002790000","percentile":"0.204760000","score_date":"2026-08-21","updated_at":"2026-08-22 00:12:49"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-68553","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-08-20T19:48:40.817549Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-08-20T19:48:45.809Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"references":[{"tags":["exploit"],"url":"https://github.com/coturn/coturn/security/advisories/GHSA-4g7c-p5wg-j4hp"}],"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"product":"coturn","vendor":"coturn","versions":[{"status":"affected","version":"< 4.13.0"}]}],"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-134","description":"CWE-134: Use of Externally-Controlled Format String","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-19T20:37:42.319Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"references":[{"name":"https://github.com/coturn/coturn/security/advisories/GHSA-4g7c-p5wg-j4hp","tags":["x_refsource_CONFIRM"],"url":"https://github.com/coturn/coturn/security/advisories/GHSA-4g7c-p5wg-j4hp"},{"name":"https://github.com/coturn/coturn/commit/8fa38032bb4751e11e072d65a8eca3c06c950979","tags":["x_refsource_MISC"],"url":"https://github.com/coturn/coturn/commit/8fa38032bb4751e11e072d65a8eca3c06c950979"},{"name":"https://github.com/coturn/coturn/releases/tag/4.13.0","tags":["x_refsource_MISC"],"url":"https://github.com/coturn/coturn/releases/tag/4.13.0"}],"source":{"advisory":"GHSA-4g7c-p5wg-j4hp","discovery":"UNKNOWN"},"title":"Coturn: Format String Injection via TURN USERNAME/REALM into hiredis Redis Command"}},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2026-68553","datePublished":"2026-08-19T20:37:42.319Z","dateReserved":"2026-07-30T19:56:44.102Z","dateUpdated":"2026-08-20T19:48:45.809Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-19 21:17:28","lastModifiedDate":"2026-08-20 20:17:45","problem_types":["CWE-134","CWE-134 CWE-134: Use of Externally-Controlled Format String"],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":4.2}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-08-20T19:48:40.817549Z","id":"CVE-2026-68553","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"68553","Ordinal":"1","Title":"Coturn: Format String Injection via TURN USERNAME/REALM into hir","CVE":"CVE-2026-68553","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"68553","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Coturn: Format String Injection via TURN USERNAME/REALM into hir"}]}}}