CVE-2025-68142CWE-1333

PyMdown Extensions has ReDOS bug in Figure Capture extension

Low · published December 16, 2025

CVSS v4.0
2.7
EPSS
0%
Percentile
40.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
2.7 · LOW
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
EPSS
0.00484 · 40.7th percentile
Weakness
CWE-1333 · Inefficient Regular Expression Complexity
Published
2025-12-16T18:06Z
EPSS history
Timeline
  • 16 DEC 18:06Z
    PyMdown Extensions has ReDOS bug in Figure Capture extension
    cvelistv5