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CVE-2025-68142— PyMdown Extensions has ReDOS bug in Figure Capture extension

Quick assessment

Affected
facelessuser pymdown-extensions
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PyMdown Extensions是Isaac Muse个人开发者的一个Python Markdown的扩展集合。 PyMdown Extensions 10.16.1之前版本存在安全漏洞，该漏洞源于figure caption扩展存在ReDOS漏洞，可能导致处理恶意负载时长时间挂起。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.48% · P41

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2025-68142

Vulnerability Information
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Vulnerability Title
PyMdown Extensions has ReDOS bug in Figure Capture extension
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
PyMdown Extensions 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PyMdown Extensions是Isaac Muse个人开发者的一个Python Markdown的扩展集合。 PyMdown Extensions 10.16.1之前版本存在安全漏洞，该漏洞源于figure caption扩展存在ReDOS漏洞，可能导致处理恶意负载时长时间挂起。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
facelessuser pymdown-extensions < 10.16.1 -

II. Public POCs for CVE-2025-68142

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III. Intelligence Information for CVE-2025-68142

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Patches & Fixes for CVE-2025-68142 (1)

Vendor Advisories for CVE-2025-68142 (1)

Other References for CVE-2025-68142 (1)

IV. Related Vulnerabilities

Same product: pymdown-extensions
Same vendor: facelessuser
Same weakness: CWE-1333

V. Comments for CVE-2025-68142

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