Security advisory

{
  "id": "b5d035eb89dcbd450927a7b454459dda165edf51b4d0cf7f4ee5ac138a6772ad",
  "url": "https://osv.dev/vulnerability/CVE-2018-19797",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-19797",
    "summary": "In LibSass 3.5.5, a NULL Pointer Dereference in the function Sass::Selector_List::populate_extends in SharedPtr.hpp (used by ast.cpp and ast_selectors.cpp) may cause a Denial of Service (application crash) via a crafted sass input file.",
    "evidence": "osv:CVE-2018-19797",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2018-19797",
      "aliases": [
        "CVE-2018-19797"
      ],
      "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/sass/libsass",
              "type": "GIT",
              "events": [
                {
                  "introduced": "39e30874b9a5dd6a802c20e8b0470ba44eeba929"
                },
                {
                  "last_affected": "39e30874b9a5dd6a802c20e8b0470ba44eeba929"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:sass-lang:libsass:3.5.5:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.5.5"
                      },
                      {
                        "last_affected": "3.5.5"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.5.5"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-19797.json"
          }
        }
      ],
      "modified": "2026-10-24T10:48:40.763196657Z",
      "provider": "osv",
      "references": [
        "https://github.com/sass/libsass/issues/2779"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:sass-lang:libsass:3.5.5:*:*:*:*:*:*:*"
            ],
            "vendor_product": "sass-lang:libsass",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "3.5.5"
                  },
                  {
                    "last_affected": "3.5.5"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2018-19797",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 441622,
  "published_at": "2018-12-03T06:29:00.743+00:00"
}