CVE-2026-68554

{
  "id": "CVE-2026-68554",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-19T21:17:28.310",
  "lastModified": "2026-10-26T10:10:00.140",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.15.0, an on-path attacker can append attributes after MESSAGE-INTEGRITY to an authenticated STUN request on plain UDP or TCP, adjust the STUN header length, and recompute the unkeyed FINGERPRINT while the original HMAC remains valid because it covers only the message prefix. Server-side parsing in src/server/ns_turn_server.c continues past MESSAGE-INTEGRITY through handle_turn_allocate(), handle_turn_create_permission(), handle_turn_refresh(), and handle_turn_command(), allowing trailing LIFETIME, XOR-PEER-ADDRESS, or ORIGIN attributes to override allocation lifetime, inject a permission, or bypass the origin check. TLS and DTLS deployments prevent this in-transit modification. This issue is fixed in version 4.15.0."
    },
    {
      "lang": "es",
      "value": "Coturn es una implementación de código abierto gratuita de servidor TURN y STUN. Antes de la versión 4.15.0, un atacante en la ruta puede añadir atributos después de MESSAGE-INTEGRITY a una solicitud STUN autenticada en UDP o TCP sin cifrar, ajustar la longitud del encabezado STUN y recalcular el FINGERPRINT sin clave mientras el HMAC original sigue siendo válido porque solo cubre el prefijo del mensaje. El análisis del lado del servidor en src/server/ns_turn_server.c continúa más allá de MESSAGE-INTEGRITY a través de handle_turn_allocate(), handle_turn_create_permission(), handle_turn_refresh() y handle_turn_command(), permitiendo que los atributos finales LIFETIME, XOR-PEER-ADDRESS u ORIGIN anulen la vida útil de la asignación, inyecten un permiso o eludan la verificación de origen. Las implementaciones de TLS y DTLS evitan esta modificación en tránsito. Este problema está corregido en la versión 4.15.0."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "coturn",
          "product": "coturn",
          "versions": [
            {
              "version": "< 4.15.0",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "baseScore": 2.3,
          "baseSeverity": "LOW",
          "attackVector": "ADJACENT",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "LOW",
          "vulnAvailabilityImpact": "LOW",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-20T13:31:52.424319Z",
          "id": "CVE-2026-68554",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-345"
        },
        {
          "lang": "en",
          "value": "CWE-924"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/coturn/coturn/commit/ab762f334f511ea37ab4b703a47d5d683a5be978",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/coturn/coturn/releases/tag/4.15.0",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/coturn/coturn/security/advisories/GHSA-5538-7cxj-5jcc",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/coturn/coturn/security/advisories/GHSA-5538-7cxj-5jcc",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}