Security advisory

{
  "id": "99cdeb38f5201755ef89ade559b1d16de87f7480a42f8cba35aba13cede7faf7",
  "url": "https://osv.dev/vulnerability/CVE-2018-20822",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-20822",
    "summary": "LibSass 3.5.4 allows attackers to cause a denial-of-service (uncontrolled recursion in Sass::Complex_Selector::perform in ast.hpp and Sass::Inspect::operator in inspect.cpp).",
    "evidence": "osv:CVE-2018-20822",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2018-20822",
      "aliases": [
        "CVE-2018-20822"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/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": "1e52b74306b7d73a617396c912ca436dc55fd4d8"
                },
                {
                  "last_affected": "1e52b74306b7d73a617396c912ca436dc55fd4d8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:sass-lang:libsass:3.5.4:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.5.4"
                      },
                      {
                        "last_affected": "3.5.4"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.5.4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-20822.json"
          }
        }
      ],
      "modified": "2026-10-24T10:49:39.585440414Z",
      "provider": "osv",
      "references": [
        "https://github.com/sass/libsass/issues/2671"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:sass-lang:libsass:3.5.4:*:*:*:*:*:*:*"
            ],
            "vendor_product": "sass-lang:libsass",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "3.5.4"
                  },
                  {
                    "last_affected": "3.5.4"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2018-20822",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 441790,
  "published_at": "2019-04-23T14:29:00.54+00:00"
}