Security advisory

{
  "id": "ffe89788d4d02e3ba0b0499d099d3c5ac1084b6186c9e61aa4fa087a5ce7e2b0",
  "url": "https://osv.dev/vulnerability/CVE-2017-6920",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2017-6920",
    "summary": "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.",
    "evidence": "osv:CVE-2017-6920",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2017-6920",
      "aliases": [
        "CVE-2017-6920",
        "GHSA-9c24-g32g-35rj"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/drupal/drupal",
              "type": "GIT",
              "events": [
                {
                  "introduced": "35c2f3ca5c935f3d8bde15932a712677c9bbd50f"
                },
                {
                  "fixed": "a795651d0b60a8a5d4867223fbc10bcbdfb5ee87"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.0.0"
                      },
                      {
                        "fixed": "8.3.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "8.3.3",
            "8.3.2",
            "8.3.0",
            "8.3.0-rc2",
            "8.3.0-rc1",
            "8.3.0-beta1",
            "8.3.0-alpha1",
            "8.1.0-beta1",
            "8.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-6920.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:45.529239404Z",
      "provider": "osv",
      "references": [
        "https://www.drupal.org/forum/newsletters/security-advisories-for-drupal-core/2017-06-21/drupal-core-multiple"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2017-6920",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 436134,
  "published_at": "2018-08-06T15:29:00.237+00:00"
}