CVE-2026-63388

{
  "id": "CVE-2026-63388",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-20T18:16:36.893",
  "lastModified": "2026-10-26T10:10:00.140",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a heap out-of-bounds write in bufferevent_sock.c when bufferevent_socket_set_conn_address_ copies a kernel-supplied AF_UNIX peer address into bufferevent_private.conn_address. Release builds compiled with NDEBUG disable the EVUTIL_ASSERT length guard, and the evhttp accept path can pass a 110-byte sockaddr from accept() into the 28-byte field. An unauthenticated local peer able to connect to an AF_UNIX listener can overwrite the adjacent dns_request pointer and heap data, causing memory corruption with confidentiality, integrity, and availability impact. This issue is fixed in versions 2.1.13 and 2.2.2-alpha."
    },
    {
      "lang": "es",
      "value": "Libevent es una biblioteca de notificación de eventos. Antes de las versiones 2.1.13 y 2.2.2-alpha, libevent tiene una escritura fuera de límites en el heap en bufferevent_sock.c cuando bufferevent_socket_set_conn_address_ copia una dirección de par AF_UNIX suministrada por el kernel en bufferevent_private.conn_address. Las compilaciones de lanzamiento compiladas con NDEBUG deshabilitan la protección de longitud EVUTIL_ASSERT, y la ruta de aceptación de evhttp puede pasar una sockaddr de 110 bytes de accept() al campo de 28 bytes. Un par local no autenticado capaz de conectarse a un oyente AF_UNIX puede sobrescribir el puntero dns_request adyacente y los datos del heap, causando corrupción de memoria con impacto en la confidencialidad, integridad y disponibilidad. Este problema está corregido en las versiones 2.1.13 y 2.2.2-alpha."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "libevent",
          "product": "libevent",
          "versions": [
            {
              "version": "< 2.1.13",
              "status": "affected"
            },
            {
              "version": ">= 2.2.0-alpha, < 2.2.2-alpha",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 8.4,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-21T21:00:24.903079Z",
          "id": "CVE-2026-63388",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-617"
        },
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/libevent/libevent/commit/52057cb33d0c20c0a0453fbabe6c0c96854931b9",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/libevent/libevent/commit/ef38f926e9cd1f082416c6fff13587bc1f431d72",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/libevent/libevent/security/advisories/GHSA-cvq5-vrvr-j338",
      "source": "[email protected]"
    }
  ]
}