Security advisory

{
  "id": "44c308d40b58bcaa6bb2955183731ee6b60b42102fbe1dcb276dc007bd61ddca",
  "url": "https://osv.dev/vulnerability/CVE-2023-26920",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2023-26920",
    "summary": "fast-xml-parser before 4.1.2 allows __proto__ for Prototype Pollution.",
    "evidence": "osv:CVE-2023-26920",
    "products": [],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-26920",
      "aliases": [
        "CVE-2021-26920",
        "CVE-2023-26920",
        "GHSA-793h-6f7r-6qvm",
        "GHSA-x3cc-x39p-42qx"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/naturalintelligence/fast-xml-parser",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2b032a4f799c63d83991e4f992f1c68e4dd05804"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.1.2"
                      }
                    ],
                    "source": "DESCRIPTION"
                  },
                  {
                    "range": [
                      {
                        "fixed": "2b032a4f799c63d83991e4f992f1c68e4dd05804"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "cpe": "cpe:2.3:a:naturalintelligence:fast_xml_parser:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.1.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.1.1",
            "v4.1.0",
            "v4.0.15",
            "v4.0.14",
            "v4.0.13",
            "v4.0.12",
            "v4.0.11",
            "v4.0.10",
            "v4.0.9",
            "v4.0.8",
            "v4.0.7",
            "v4.0.6",
            "v4.0.5",
            "v4.0.4",
            "v4.0.2",
            "v4.0.1",
            "v4.0.0",
            "v4.0.0-beta.6",
            "v4.0.0-beta.5",
            "v4.0.0-beta.4",
            "v4.0.0-beta.3",
            "v4.0.0-beta.2",
            "v4.0.0-beta.0",
            "v3.21.1",
            "v3.21.0",
            "v3.20.3",
            "v3.20.2",
            "v3.20.1",
            "v3.20.0",
            "3.19.0",
            "3.18.0",
            "3.17.5",
            "3.17.1",
            "3.16.0",
            "v3.15.0",
            "3.14.0",
            "3.13.0",
            "3.12.16",
            "3.12.5",
            "3.10.0",
            "3.4.0",
            "3.2.0",
            "3.0.0",
            "2.9.4",
            "2.9.3"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-26920.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.345109022Z",
      "provider": "osv",
      "references": [
        "https://gist.github.com/Sudistark/a5a45bd0804d522a1392cb5023aa7ef7",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/26xxx/CVE-2023-26920.json",
        "https://github.com/advisories/GHSA-793h-6f7r-6qvm",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-26920",
        "https://github.com/NaturalIntelligence/fast-xml-parser/commit/2b032a4f799c63d83991e4f992f1c68e4dd05804"
      ],
      "provider_metadata": {
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/26xxx/CVE-2023-26920.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-26920",
        "evidence": "/aliases"
      },
      {
        "value": "CVE-2023-26920",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 490942,
  "published_at": "2023-12-12T00:00:00+00:00"
}