Vulnerability in Facelessuser Pymdown-extensions
CVE-2025-68142
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 con…
Vulnerability class: ReDoS (Regular Expression Denial of Service)
EPSS: 0.004 (28.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Facelessuser Pymdown-extensions — versions < 10.16.1
- Facelessuser Pymdown_extensions
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Patch, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2025-68142?
- CVE-2025-68142 is a medium-severity vulnerability in Facelessuser Pymdown-extensions, classified under Inefficient Regular Expression Complexity. CVSS score: 5.3/10. Published 2025-12-16.
- How severe is CVE-2025-68142?
- Medium severity. CVSS v3 base score is 5.3 out of 10.