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CVE-2025-68142
Good to know:
Date: December 16, 2025
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.
Severity Score
Related Resources (6)
Severity Score
Weakness Type (CWE)
Inefficient Regular Expression Complexity
CWE-1333Top Fix
Upgrade Version
Upgrade to version pymdown-extensions - 10.16.1;pymdown-extensions - 10.16.1;https://github.com/facelessuser/pymdown-extensions.git - 10.16.1
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | NONE |
| User Interaction (UI): | NONE |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | NONE |
| Integrity (I): | NONE |
| Availability (A): | LOW |