Vulnerability Description
PyMdown Extensions is a set of extensions for the `Python-Markdown` markdown project. Versions prior to 10.16.1 have a ReDOS bug found within the figure caption extension (`pymdownx.blocks.caption`). In systems that take unchecked user content, this could cause long hanges when processing the data if a malicious payload was crafted. This issue is patched in Release 10.16.1. As a workaround, those who process unknown user content without timeouts or other safeguards in place to prevent really large, malicious content being aimed at systems may avoid the use of `pymdownx.blocks.caption` until they're able to upgrade.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Facelessuser | Pymdown Extensions | < 10.16.1 |
Related Weaknesses (CWE)
References
- https://github.com/facelessuser/pymdown-extensions/commit/b50d15a56850ed1408a284Patch
- https://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-r6h4ExploitPatchVendor Advisory
- https://pypi.org/project/pymdown-extensions/10.16.1ProductRelease Notes
FAQ
What is CVE-2025-68142?
CVE-2025-68142 is a vulnerability with a CVSS score of 5.3 (MEDIUM). PyMdown Extensions is a set of extensions for the `Python-Markdown` markdown project. Versions prior to 10.16.1 have a ReDOS bug found within the figure caption extension (`pymdownx.blocks.caption`). ...
How severe is CVE-2025-68142?
CVE-2025-68142 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-68142?
Check the references section above for vendor advisories and patch information. Affected products include: Facelessuser Pymdown Extensions.