fast-xml-parser has RangeError DoS Numeric Entities Bug

{
  "id": "cf12b6fc0c8efdb4ac8fc7766b12b099990a0cfbda78c00bbb302e87355d86a6",
  "url": "https://osv.dev/vulnerability/CVE-2026-25128",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "fast-xml-parser has RangeError DoS Numeric Entities Bug",
    "summary": "fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object without C/C++ based libraries and no callback. In versions 5.0.9 through 5.3.3, a RangeError vulnerability exists in the numeric entity processing of fast-xml-parser when parsing XML with out-of-range entity code points (e.g., `�` or `�`). This causes the parser to throw an uncaught exception, crashing any application that processes untrusted XML input. Version 5.3.4 fixes the issue.",
    "evidence": "osv:CVE-2026-25128",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-25128",
      "aliases": [
        "CVE-2026-25128",
        "GHSA-37qj-frw5-hhjh"
      ],
      "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/naturalintelligence/fast-xml-parser",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1d3923919e2a9f19a2db2f2918547693286130f3"
                },
                {
                  "fixed": "753e770f69d0f30c95b0287f7b8c57e4a93bbc12"
                },
                {
                  "fixed": "4e387f61c4a5cef792f6a2f42467013290bf95dc"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:naturalintelligence:fast-xml-parser:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.0.9"
                      },
                      {
                        "fixed": "5.3.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "4e387f61c4a5cef792f6a2f42467013290bf95dc"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "753e770f69d0f30c95b0287f7b8c57e4a93bbc12"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v5.3.4"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v5.3.3",
            "v5.3.2",
            "v5.3.1",
            "v5.3.0",
            "v5.2.5",
            "v5.2.3",
            "v5.2.2",
            "v5.2.1",
            "v5.2.0",
            "v5.1.0",
            "v5.0.9"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25128.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.296724469Z",
      "provider": "osv",
      "references": [
        "https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.3.4",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25128.json",
        "https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-37qj-frw5-hhjh",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-25128",
        "https://github.com/NaturalIntelligence/fast-xml-parser/commit/4e387f61c4a5cef792f6a2f42467013290bf95dc"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-20",
          "CWE-248"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25128.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-25128",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491827,
  "published_at": "2026-01-30T15:14:58.244+00:00"
}