CVE-2026-68555

{
  "id": "CVE-2026-68555",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-19T21:17:28.453",
  "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. In 4.15.0, an authenticated TURN user can repeatedly resume one allocation from fresh UDP 5-tuples without completing a handoff when the server enables --mobility. mobile_begin_transition() in src/server/ns_turn_server.c disarms each new session's allocation timeout and overwrites the allocation's single mobile_pending_resume link, leaving earlier pending sessions unreachable by the cleanup path, while copy_auth_parameters() ignores inc_quota() failure. The attacker can therefore retain unbounded server-side sessions and exhaust process memory even when --user-quota=1 is configured. This issue is fixed in version 4.16.0."
    },
    {
      "lang": "es",
      "value": "Coturn es una implementación gratuita de código abierto de servidor TURN y STUN. En 4.15.0, un usuario TURN autenticado puede reanudar repetidamente una asignación desde nuevas 5-tuplas UDP sin completar una transferencia cuando el servidor habilita --mobility. mobile_begin_transition() en src/server/ns_turn_server.c desactiva el tiempo de espera de asignación de cada nueva sesión y sobrescribe el único enlace mobile_pending_resume de la asignación, dejando las sesiones pendientes anteriores inalcanzables por la ruta de limpieza, mientras que copy_auth_parameters() ignora el fallo de inc_quota(). El atacante puede, por lo tanto, retener sesiones ilimitadas del lado del servidor y agotar la memoria del proceso incluso cuando --user-quota=1 está configurado. Este problema está solucionado en la versión 4.16.0."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "coturn",
          "product": "coturn",
          "versions": [
            {
              "version": ">= 4.15.0, < 4.16.0",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-21T18:13:53.709392Z",
          "id": "CVE-2026-68555",
          "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-400"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/coturn/coturn/commit/a97f1924bb435bec49d6d91ae01fa2487c2e1bf7",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/coturn/coturn/releases/tag/4.16.0",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/coturn/coturn/security/advisories/GHSA-hpq3-g7x4-h7xx",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/coturn/coturn/security/advisories/GHSA-hpq3-g7x4-h7xx",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}