Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS1jZzg3LXdteDQtdjU0Ns4ABDg9

KaTeX \htmlData does not validate attribute names

Impact

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:

• Open an issue or security advisory in the KaTeX repository
• Email us at [email protected]

Permalink: https://github.com/advisories/GHSA-cg87-wmx4-v546
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1jZzg3LXdteDQtdjU0Ns4ABDg9
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: about 4 hours ago
Updated: about 4 hours ago

CVSS Score: 6.3
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Identifiers: GHSA-cg87-wmx4-v546, CVE-2025-23207
References:

• https://github.com/KaTeX/KaTeX/security/advisories/GHSA-cg87-wmx4-v546
• https://github.com/KaTeX/KaTeX/commit/ff289955e81aab89086eef09254cbf88573d415c
• https://github.com/advisories/GHSA-cg87-wmx4-v546

Repository: https://github.com/KaTeX/KaTeX
Blast Radius: 27.5

Affected Packages