{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "coturn",
          "vendor": "coturn",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 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": "2026-08-19T20:37:42.319Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-68553",
      "date": "2026-08-20",
      "epss": "0.00279",
      "percentile": "0.20453"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-68553\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-08-19T21:17:28.163\",\"lastModified\":\"2026-08-19T21:17:28.163\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"coturn\",\"product\":\"coturn\",\"versions\":[{\"version\":\"\u003c 4.13.0\",\"status\":\"affected\"}]}]}],\"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}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-134\"}]}],\"references\":[{\"url\":\"https://github.com/coturn/coturn/commit/8fa38032bb4751e11e072d65a8eca3c06c950979\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/coturn/coturn/releases/tag/4.13.0\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/coturn/coturn/security/advisories/GHSA-4g7c-p5wg-j4hp\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}