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Vulnerabilities

Security fix · CVE-2025-68142

PyMdown Extensions is a set of extensions for the markdown project.

Published Dec 16, 2025 · catalog updated Dec 17, 2025 · PyMdown Extensions is a

Last checked Nov 2, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-68142. EPSS is 0.48%. Act only if a listed version of PyMdown Extensions is a is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (PyMdown Extensions is a).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Low2.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.48%
Remediation
Version ranges on file
Affected products
vendor facelessuser pymdown-extensions < 10.16.1

PyMdown Extensions is a set of extensions for the markdown project. Versions prior to 10.16.1 have a ReDOS bug found within the figure caption extension ( ). 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 until they're able to upgrade.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor facelessuser pymdown-extensions < 10.16.1< 10.16.1

How to fix CVE-2025-68142

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-68142. EPSS is 0.48%. Act only if a listed version of PyMdown Extensions is a is installed.

Which versions are affected?

Compare what you have installed with facelessuser pymdown-extensions < 10.16.1 < 10.16.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.48%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 16, 2025 · EUVD

    Detected

    PyMdown Extensions is a set of extensions for the markdown project. Versions prior to 10.16.1 have a ReDOS bug found within the figure caption extension ( ). 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 t

  2. Dec 17, 2025 · EUVD

    Updated

    PyMdown Extensions is a set of extensions for the markdown project. Versions prior to 10.16.1 have a ReDOS bug found within the figure caption extension ( ). 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 t

Sources

  • CVE.orgVulnerability recordCVE-2025-68142

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-68142

    30-day exploitation probability 0.48%

    first.org
  • EUVDVulnerability recordEUVD-2025-203840

    PyMdown Extensions is a set of extensions for the markdown project. Versions prior to 10.16.1 have a ReDOS bug found within the figure caption extension ( ). In systems that take unchecked user content, this could cause long hanges when processing the data if a malicious payload

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 2, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 2, 2026
  • CVE.orgNov 2, 2026
  • EUVDNov 1, 2026