CVE-2025-6493 (Medium) detected in codemirror-5.58.3.tgz

[mend-bolt-for-github]

CVE-2025-6493 - Medium Severity Vulnerability

Vulnerable Library - codemirror-5.58.3.tgz

Full-featured in-browser code editor

Library home page: https://registry.npmjs.org/codemirror/-/codemirror-5.58.3.tgz

Path to dependency file: /package.json

Path to vulnerable library: /package.json

Dependency Hierarchy:

• ❌ codemirror-5.58.3.tgz (Vulnerable Library)

Found in HEAD commit: d87706978173ac6516da5e83374518c21263b77b

Found in base branch: master

Vulnerability Details

A vulnerability was found in CodeMirror up to 5.17.0 and classified as problematic. Affected by this issue is some unknown functionality of the file mode/markdown/markdown.js of the component Markdown Mode. The manipulation leads to inefficient regular expression complexity. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. Not all code samples mentioned in the GitHub issue can be found. The repository mentions, that "CodeMirror 6 exists, and is [...] much more actively maintained."

• While the issue was reported up to version 5.17.0, the problematic patterns persisted in versions after that. In version 6.x, the issue has been resolved.

Mend Note: The description of this vulnerability differs from MITRE.

Publish Date: 2025-06-22

URL: CVE-2025-6493

CVSS 3 Score Details (5.3)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: Low

For more information on CVSS3 Scores, click here.

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[GilbertCherrie]

I don't think we can fix this issue @Fryguy. Even though we directly use codemirror ~5.x, even if we fix the breaking issues of the upgrade and do the upgrade from version 5 to 6 we still use a package called react-codemirror2, which contains a peer-dependency for codemirror 5.x https://github.com/scniro/react-codemirror2/blob/673a66822d6e56486075ea6336d258172f6361f7/package.json#L54. I upgraded to the latest version of codemirror 5 in this pr: #9534 but it won't fix this CVE.