{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "8.0.0"
              },
              {
                "fixed": "8.3.4"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "35c2f3ca5c935f3d8bde15932a712677c9bbd50f"
            },
            {
              "fixed": "a795651d0b60a8a5d4867223fbc10bcbdfb5ee87"
            }
          ],
          "repo": "https://github.com/drupal/drupal",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {},
  "details": "Drupal core 8 before versions 8.3.4 allows remote attackers to execute arbitrary code due to the PECL YAML parser not handling PHP objects safely during certain operations.",
  "id": "CVE-2017-6920",
  "modified": "2026-07-08T05:39:03.781860307Z",
  "published": "2018-08-06T15:29:00.237Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "http://www.securityfocus.com/bid/99211"
    },
    {
      "type": "ADVISORY",
      "url": "http://www.securitytracker.com/id/1038781"
    },
    {
      "type": "FIX",
      "url": "https://www.drupal.org/forum/newsletters/security-advisories-for-drupal-core/2017-06-21/drupal-core-multiple"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}