coturn — security advisory

{
  "id": "b6e8e55154b981280877a97cfd876427254d38ba1a3f218396e3d2d9272054e8",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-68553",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-68553",
    "summary": "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.",
    "evidence": "osv:DEBIAN-CVE-2026-68553",
    "products": [
      {
        "name": {
          "value": "coturn",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "4.12.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.14.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.15.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.18.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.6.1-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.6.1-2",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "coturn",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "4.12.0-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "4.14.0-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "4.15.0-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "4.18.0-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "4.6.1-2",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "coturn",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.14.0-1",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "4.12.0-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "4.6.1-2",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "DEBIAN-CVE-2026-68553",
      "aliases": [
        "DEBIAN-CVE-2026-68553"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "coturn",
            "purl": "pkg:deb/debian/coturn?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "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"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-68553.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "coturn",
            "purl": "pkg:deb/debian/coturn?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
            "4.12.0-1",
            "4.14.0-1",
            "4.15.0-1",
            "4.18.0-1",
            "4.6.1-2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-68553.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4.14.0-1"
                }
              ]
            }
          ],
          "package": {
            "name": "coturn",
            "purl": "pkg:deb/debian/coturn?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "4.12.0-1",
            "4.6.1-2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-68553.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-27T09:47:42.838394768Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-68553"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-68553"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-68553",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 461441,
  "published_at": "2026-08-19T21:17:28.163+00:00"
}