Security advisory

{
  "id": "470031431fcafd4cbb33e15ab4ebcb0acd38059800179f3d566373b8660691fa",
  "url": "https://osv.dev/vulnerability/CVE-2018-18956",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-18956",
    "summary": "The ProcessMimeEntity function in util-decode-mime.c in Suricata 4.x before 4.0.6 allows remote attackers to cause a denial of service (segfault and daemon crash) via crafted input to the SMTP parser, as exploited in the wild in November 2018.",
    "evidence": "osv:CVE-2018-18956",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2018-18956",
      "aliases": [
        "CVE-2018-18956"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/oisf/suricata",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b8428378ac6fb2365337ae765e19dfc0f4548e4a"
                },
                {
                  "fixed": "ab751da633e2aea44a210c7ac690a8617efa98cd"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:suricata-ids:suricata:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.0.0"
                      },
                      {
                        "fixed": "4.0.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "suricata-4.0.5",
            "suricata-4.0.4",
            "suricata-4.0.3",
            "suricata-4.0.2",
            "suricata-4.0.1",
            "suricata-4.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-18956.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:31.079299199Z",
      "provider": "osv",
      "references": [
        "https://lists.openinfosecfoundation.org/pipermail/oisf-users/2018-November/016316.html",
        "https://lists.openinfosecfoundation.org/pipermail/oisf-users/2018-October/016227.html",
        "https://redmine.openinfosecfoundation.org/issues/2658#change-10374"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-18956",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 432721,
  "published_at": "2018-11-05T21:29:00.257+00:00"
}