KaTeX \htmlData does not validate attribute names

Description

KaTeX users who render untrusted mathematical expressions with renderToString could encounter malicious input using \htmlData that runs arbitrary JavaScript, or generate invalid HTML.

Recommendation

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

• Affected version(s): >= 0.12.0, <= 0.16.20
• Patched version(s): 0.16.21

References

• GHSA-cg87-wmx4-v546
• CVE-2025-23207
• CWE-116
• CWE-79
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• KaTeX missing normalization of the protocol in URLs allows bypassing forbidden protocols - CVE-2024-28246
• KaTeX's maxExpand bypassed by Unicode sub/superscripts - CVE-2024-28244
• KaTeX's maxExpand bypassed by `\edef` - CVE-2024-28243
• KaTeX's `\includegraphics` does not escape filename - CVE-2024-28245

Tags:

npm

katex