Security advisory

{
  "id": "ec0a5727dfde373e8a211ff5e8c9ff6885acc94304eab15066f4de92325286d7",
  "url": "https://osv.dev/vulnerability/CVE-2021-33587",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-33587",
    "summary": "The css-what package 4.0.0 through 5.0.0 for Node.js does not ensure that attribute parsing has Linear Time Complexity relative to the size of the input.",
    "evidence": "osv:CVE-2021-33587",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-33587",
      "aliases": [
        "CVE-2021-33587",
        "GHSA-q8pj-2vqx-8ggc"
      ],
      "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/fb55/css-what",
              "type": "GIT",
              "events": [
                {
                  "introduced": "a868f3e0b284883721da97eb0deaadb0e857e630"
                },
                {
                  "last_affected": "15227a74654a4dd39b89416959b6d179f021d551"
                },
                {
                  "fixed": "e9106aa26ece8efbdf85e3219a9f8513897160ab"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:css-what_project:css-what:4.0.0:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "4.0.0"
                      },
                      {
                        "last_affected": "4.0.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:css-what_project:css-what:5.0.0:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "5.0.0"
                      },
                      {
                        "last_affected": "5.0.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "range": [
                      {
                        "fixed": "e9106aa26ece8efbdf85e3219a9f8513897160ab"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v5.0.1"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.0.0",
            "5.0.0",
            "v5.0.0",
            "v4.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-33587.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:45.887974712Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2023/03/msg00001.html",
        "https://security.netapp.com/advisory/ntap-20210706-0007/",
        "https://github.com/fb55/css-what/releases/tag/v5.0.1"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-33587",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386112,
  "published_at": "2021-05-28T20:15:07.733+00:00"
}