Security advisory

{
  "id": "ed21e17fb0256094483a9d56c86fbc4cc6bc5b5f0c34c2f043c885ccdab03af3",
  "url": "https://osv.dev/vulnerability/CVE-2018-20349",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-20349",
    "summary": "The igraph_i_strdiff function in igraph_trie.c in igraph through 0.7.1 has an NULL pointer dereference that allows attackers to cause a denial of service (application crash) via a crafted object.",
    "evidence": "osv:CVE-2018-20349",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2018-20349",
      "aliases": [
        "CVE-2018-20349"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/igraph/igraph",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "1e0d10cba19e2dc2407174230204ecbc18cef95a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:igraph:igraph:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.7.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.7.1-post",
            "0.7.1",
            "0.7.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-20349.json"
          }
        }
      ],
      "modified": "2026-10-20T10:48:05.363978588Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2019/12/msg00038.html",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NCGDUNQYLSZLSGN6JJBORVFW46U3A75Y/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OWCGXEINKJM3JQUPVCSN4RBTRKWBTYI7/",
        "https://github.com/igraph/igraph/issues/1141"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-20349",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 380027,
  "published_at": "2018-12-22T00:29:00.273+00:00"
}