GHSA-CG87-WMX4-V546

Vulnerability from github – Published: 2025-01-17 21:22 – Updated: 2025-01-21 18:31
VLAI?
Summary
KaTeX \htmlData does not validate attribute names
Details

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:

Severity ?
6.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.16.20"
      },
      "package": {
        "ecosystem": "npm",
        "name": "katex"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.12.0"
            },
            {
              "fixed": "0.16.21"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-23207"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-116",
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-01-17T21:22:56Z",
    "nvd_published_at": "2025-01-17T22:15:29Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nKaTeX users who render untrusted mathematical expressions with `renderToString` could encounter malicious input using `\\htmlData` that runs arbitrary JavaScript, or generate invalid HTML.\n\n### Patches\nUpgrade to KaTeX v0.16.21 to remove this vulnerability.\n\n### Workarounds\n- Avoid use of or turn off the `trust` option, or set it to forbid `\\htmlData` commands.\n- Forbid inputs containing the substring `\"\\\\htmlData\"`.\n- Sanitize HTML output from KaTeX.\n\n### Details\n`\\htmlData` did not validate its attribute name argument, allowing it to generate invalid or malicious HTML that runs scripts.\n\n### For more information\nIf you have any questions or comments about this advisory:\n\n- Open an issue or security advisory in the [KaTeX repository](https://github.com/KaTeX/KaTeX/)\n- Email us at [katex-security@mit.edu](mailto:katex-security@mit.edu)",
  "id": "GHSA-cg87-wmx4-v546",
  "modified": "2025-01-21T18:31:02Z",
  "published": "2025-01-17T21:22:56Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/KaTeX/KaTeX/security/advisories/GHSA-cg87-wmx4-v546"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-23207"
    },
    {
      "type": "WEB",
      "url": "https://github.com/KaTeX/KaTeX/commit/ff289955e81aab89086eef09254cbf88573d415c"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/KaTeX/KaTeX"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "KaTeX \\htmlData does not validate attribute names"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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