pymdown-extensions: PyMdown Extensions is a set of extensions for the `Python-Markdown` markdown project
CVE-2025-68142 is fixed in pymdown-extensions on 1 platform, first by DEBIAN-CVE-2025-68142, released December 16, 2025. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| pymdown-extensions · Debian 13.5 (trixie) | 10.13-1+deb13u1 | DEBIAN-CVE-2025-68142 | Dec 16, 2025 |
| pymdown-extensions · Debian 14 | 10.13-4 | DEBIAN-CVE-2025-68142 | Dec 16, 2025 |
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