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KaTeX users who render untrusted mathematical expressions with renderToString could encounter malicious input using \htmlData that runs arbitrary JavaScript, or generate invalid HTML.
Patches
Upgrade to KaTeX v0.16.21 to remove this vulnerability.
Workarounds
Avoid use of or turn off the trust option, or set it to forbid \htmlData commands.
Forbid inputs containing the substring "\\htmlData".
Sanitize HTML output from KaTeX.
Details
\htmlData did not validate its attribute name argument, allowing it to generate invalid or malicious HTML that runs scripts.
For more information
If you have any questions or comments about this advisory:
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This PR contains the following updates:
0.16.19->0.16.21GitHub Vulnerability Alerts
CVE-2025-23207
Impact
KaTeX users who render untrusted mathematical expressions with
renderToStringcould encounter malicious input using\htmlDatathat runs arbitrary JavaScript, or generate invalid HTML.Patches
Upgrade to KaTeX v0.16.21 to remove this vulnerability.
Workarounds
trustoption, or set it to forbid\htmlDatacommands."\\htmlData".Details
\htmlDatadid not validate its attribute name argument, allowing it to generate invalid or malicious HTML that runs scripts.For more information
If you have any questions or comments about this advisory:
Release Notes
KaTeX/KaTeX (katex)
v0.16.21Compare Source
Bug Fixes
v0.16.20Compare Source
Bug Fixes
Configuration
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