Security advisory

{
  "id": "3f26c8fd8ae587f7977347a8469c197f10d2c081f5bc126e6820f41ddcb009ed",
  "url": "https://osv.dev/vulnerability/CVE-2018-18898",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-18898",
    "summary": "The email-ingestion feature in Best Practical Request Tracker 4.1.13 through 4.4 allows denial of service by remote attackers via an algorithmic complexity attack on email address parsing.",
    "evidence": "osv:CVE-2018-18898",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2018-18898",
      "aliases": [
        "CVE-2018-18898"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/bestpractical/rt",
              "type": "GIT",
              "events": [
                {
                  "introduced": "ce5f72fbdc8bf043d45a1c09fa1c2af807a08695"
                },
                {
                  "last_affected": "7197d3dade64d6ef63a329fe0e4e24bd05ca9cd9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:bestpractical:request_tracker:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.1.13"
                      },
                      {
                        "last_affected": "4.4.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "rt-4.4.0rc3",
            "rt-4.4.0",
            "rt-4.4.0rc2",
            "rt-4.4.0rc1",
            "rt-4.1.23",
            "rt-4.1.19",
            "rt-4.1.17",
            "rt-4.1.13"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-18898.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:45.538440071Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CPJVDT77ZPRU5Z2BEMZM7EBY6WZHUATZ/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YR46PPHBEM76DNN4DEQMAYIKLCO3TQU2/",
        "https://bestpractical.com/download-page",
        "https://lists.debian.org/debian-lts-announce/2020/02/msg00009.html",
        "https://usn.ubuntu.com/4517-1/"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*",
              "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*"
            ],
            "vendor_product": "canonical:ubuntu_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "16.04"
                  },
                  {
                    "last_affected": "16.04"
                  },
                  {
                    "introduced": "18.04"
                  },
                  {
                    "last_affected": "18.04"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
              "cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "8.0"
                  },
                  {
                    "last_affected": "8.0"
                  },
                  {
                    "introduced": "10.0"
                  },
                  {
                    "last_affected": "10.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:28:*:*:*:*:*:*:*",
              "cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "28"
                  },
                  {
                    "last_affected": "28"
                  },
                  {
                    "introduced": "29"
                  },
                  {
                    "last_affected": "29"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2018-18898",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 436137,
  "published_at": "2019-03-21T16:00:29.873+00:00"
}