KaTeX missing normalization of the protocol in URLs allows bypassing forbidden protocols

Description

Code that uses KaTeX’s trust option, specifically that provides a function to block-list certain URL protocols, can be fooled by URLs in malicious inputs that use uppercase characters in the protocol.

Recommendation

Update the katex package to the latest compatible version. Followings are version details:

• Affected version(s): >= 0.11.0, < 0.16.10
• Patched version(s): 0.16.10

References

• GHSA-3wc5-fcw2-2329
• CVE-2024-28246
• CWE-184
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• AWS SDK for JavaScript v3 adopted defense in depth enhancement for region parameter value - Vulnerability
• Formio improperly authorized permission elevation through specially crafted request path - CVE-2025-67718
• KaTeX \htmlData does not validate attribute names - CVE-2025-23207
• vue-i18n's escapeParameterHtml does not prevent DOM-based XSS through its tag attributes - CVE-2025-53892

Tags:

npm

katex