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Overview

@xmldom/xmldom is a javascript ponyfill to provide the following APIs that are present in modern browsers to other runtimes. Since version 0.7.0 this package is published to npm as @xmldom/xmldom and no longer as xmldom

Affected versions of this package are vulnerable to Uncontrolled Recursion in the recursive processing of deeply nested XML documents by several DOM-related operations, including normalize, serializeToString, getElementsByTagName, getElementsByTagNameNS, getElementsByClassName, getElementById, cloneNode, importNode, textContent, and isEqualNode. An attacker can cause the application to crash or become unresponsive by submitting a valid, deeply nested XML payload that triggers uncontrolled recursion and stack exhaustion.

PoC

const { DOMParser, XMLSerializer } = require('@xmldom/xmldom');

const depth = 5000;
const xml = '<a>'.repeat(depth) + '</a>'.repeat(depth);
const doc = new DOMParser().parseFromString(xml, 'text/xml');
new XMLSerializer().serializeToString(doc);
// RangeError: Maximum call stack size exceeded

Remediation

Upgrade @xmldom/xmldom to version 0.8.13, 0.9.10 or higher.

References

• GitHub Advisory
• GitHub Commit
• GitHub Commit
• GitHub Commit
• GitHub Commit
• GitHub Commit
• GitHub Commit
• GitHub Commit
• GitHub Commit
• GitHub Commit
• GitHub Release
• GitHub Release

Overview

@xmldom/xmldom is a javascript ponyfill to provide the following APIs that are present in modern browsers to other runtimes. Since version 0.7.0 this package is published to npm as @xmldom/xmldom and no longer as xmldom

Affected versions of this package are vulnerable to XML Injection due to unvalidated comment serialization. When an application uses the package to create an XML comment from untrusted user input, the package fails to sanitize comment-breaking sequences (like -->). An attacker can input --> to terminate the comment prematurely. Once the comment is broken out of, any text the attacker places after the --> is treated as "live" XML markup by the serializer rather than harmless comment text.

PoC

const { DOMImplementation, DOMParser, XMLSerializer } = require('@xmldom/xmldom');

const doc = new DOMImplementation().createDocument(null, 'root', null);

doc.documentElement.appendChild(
  doc.createComment('--><injected attr="1"/><!--')
);

const xml = new XMLSerializer().serializeToString(doc);
console.log(xml);
// <root><!----><injected attr="1"/><!----></root>

const reparsed = new DOMParser().parseFromString(xml, 'text/xml');
console.log(reparsed.documentElement.childNodes.item(1).nodeName);
// injected

Remediation

Upgrade @xmldom/xmldom to version 0.8.13, 0.9.10 or higher.

References

• GitHub Commit
• GitHub Commit
• GitHub PR

Overview

@xmldom/xmldom is a javascript ponyfill to provide the following APIs that are present in modern browsers to other runtimes. Since version 0.7.0 this package is published to npm as @xmldom/xmldom and no longer as xmldom

Affected versions of this package are vulnerable to XML Injection in the serialization of DocumentType nodes when attacker-controlled values are provided to the publicId, systemId, or internalSubset fields. An attacker can inject arbitrary XML markup into the serialized output by supplying specially crafted input to these fields, potentially leading to the injection of malicious DOCTYPE declarations or markup outside the intended context.

Note:

This is only exploitable if untrusted data is passed programmatically to createDocumentType or written directly to the relevant properties and then serialized without enabling strict validation.

Workaround

This vulnerability can be mitigated by passing the option { requireWellFormed: true } to XMLSerializer.serializeToString() to enforce validation of the affected fields.

Remediation

Upgrade @xmldom/xmldom to version 0.8.13, 0.9.10 or higher.

References

• GitHub Advisory
• GitHub Commit
• GitHub Release
• GitHub Release

Overview

@xmldom/xmldom is a javascript ponyfill to provide the following APIs that are present in modern browsers to other runtimes. Since version 0.7.0 this package is published to npm as @xmldom/xmldom and no longer as xmldom

Affected versions of this package are vulnerable to XML Injection via the createProcessingInstruction function. An attacker can inject arbitrary XML nodes into the serialized output by supplying specially crafted data containing the PI-closing sequence, which is not validated or neutralized during serialization. This can alter the structure and meaning of generated XML documents, potentially impacting workflows that store, forward, sign, or parse XML.

Note:

This is only exploitable if the serialization is performed without passing the { requireWellFormed: true } option.

PoC

const { DOMImplementation, XMLSerializer } = require('@xmldom/xmldom');

const doc = new DOMImplementation().createDocument(null, 'r', null);
doc.documentElement.appendChild(
    doc.createProcessingInstruction('a', '?><z/><?q ')
);
console.log(new XMLSerializer().serializeToString(doc));
// <r><?a ?><z/><?q ?></r>
//          ^^^^ injected <z/> element is active markup

Remediation

Upgrade @xmldom/xmldom to version 0.8.13, 0.9.10 or higher.

References

• GitHub Advisory
• GitHub Commit
• GitHub Release
• GitHub Release

Overview

@xmldom/xmldom is a javascript ponyfill to provide the following APIs that are present in modern browsers to other runtimes. Since version 0.7.0 this package is published to npm as @xmldom/xmldom and no longer as xmldom

Affected versions of this package are vulnerable to XML Injection via the XMLSerializer() function. An attacker can manipulate the structure and integrity of generated XML documents by injecting attacker-controlled markup containing the CDATA terminator ]]> through CDATA section content, which is not properly validated or sanitized during serialization. This can result in unauthorized XML elements or attributes being inserted, potentially leading to business logic manipulation or privilege escalation in downstream consumers.

Remediation

Upgrade @xmldom/xmldom to version 0.8.12, 0.9.9 or higher.

References

• GitHub Advisory
• GitHub Commit
• GitHub Release
• GitHub Release