CVE-2026-12707

{
  "id": "CVE-2026-12707",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-14T16:16:45.297",
  "lastModified": "2026-10-24T21:10:00.130",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Summary\n\n\n\nCloudflare quiche was discovered to be vulnerable to memory resource exhaustion due to unbounded queuing of post-handshake client migration events.\n\n\n\nImpact\n\n\n\nquiche supports the connection migration features described in Section 9 of RFC 9000, which allows a single QUIC connection to survive changes in the network path. Although quiche implements the protections described in Section 9.3 of RFC 9000 to limit server state commitment, it was discovered that the collection of PathEvents, intended to be consumed by applications via the path_event_next() function, was not bounded.\n\n\n\nOnce the QUIC handshake completed, a peer could exploit rapid source address migration in order to cause unbounded queuing of the PathEvent::ReusedSourceConnectionId type. Servers are vulnerable even if active connection migration is disabled.\n\n\n\nMitigation:\n\n  *  \n\nApplications can call path_event_next() to drain the PathEvent collection, mitigating the attack.\n\n\n  *  \n\nUsers are requested to upgrade to quiche 0.29.3 which is the earliest version that prevents excessive queueing of PathEvent::ReusedSourceConnectionId."
    },
    {
      "lang": "es",
      "value": "Resumen\n\nSe descubrió que Cloudflare quiche era vulnerable al agotamiento de recursos de memoria debido al encolamiento ilimitado de eventos de migración de cliente post-handshake.\n\nImpacto\n\nquiche es compatible con las características de migración de conexión descritas en la Sección 9 de RFC 9000, lo que permite que una única conexión QUIC sobreviva a los cambios en la ruta de red. Aunque quiche implementa las protecciones descritas en la Sección 9.3 de RFC 9000 para limitar el compromiso de estado del servidor, se descubrió que la colección de PathEvents, destinada a ser consumida por las aplicaciones a través de la función path_event_next(), no estaba limitada.\n\nUna vez completado el handshake QUIC, un par podría explotar una rápida migración de dirección de origen para causar un encolamiento ilimitado del tipo PathEvent::ReusedSourceConnectionId. Los servidores son vulnerables incluso si la migración de conexión activa está deshabilitada.\n\nMitigación:\n  *  Las aplicaciones pueden llamar a path_event_next() para vaciar la colección PathEvent, mitigando el ataque.\n  *  Se solicita a los usuarios que actualicen a quiche 0.29.3, que es la versión más temprana que previene el encolamiento excesivo de PathEvent::ReusedSourceConnectionId."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Cloudflare",
          "product": "quiche",
          "defaultStatus": "unaffected",
          "repo": "https://github.com/cloudflare/quiche",
          "versions": [
            {
              "version": "0.15.0",
              "lessThan": "0.29.3",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-14T15:57:40.409163Z",
          "id": "CVE-2026-12707",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/cloudflare/quiche/security/advisories/GHSA-4q5x-gp38-rfp4",
      "source": "[email protected]"
    }
  ]
}