PT-2025-51772 · Unknown+2 · Python-Markdown+3

Published 2025-12-16 · Updated 2026-03-10 · CVE-2025-68142

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions PyMdown Extensions versions prior to 10.16.1

Description PyMdown Extensions, a set of extensions for the Python-Markdown project, contains a Regular Expression Denial of Service (ReDoS) issue within the figure caption extension (pymdownx.blocks.caption). Processing unchecked user content with versions prior to 10.16.1 could lead to long hangs if a malicious payload is crafted.

Recommendations Upgrade to version 10.16.1 or later. As a workaround, avoid using the pymdownx.blocks.caption extension until you are able to upgrade.

Exploit

Fix

DoS

Weakness Enumeration

CWE-1333

Related Identifiers

BDU:2026-03573

CVE-2025-68142

GHSA-R6H4-MM7H-8PMQ

Affected Products

Debian

Pymdown Extensions

Python-Markdown

Red Os

References · 18

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68142.json · Exploit
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-68142 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-68142 · Security Note
• https://osv.dev/vulnerability/CVE-2025-68142 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-68142 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-03573 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-68142 · Security Note
• https://ubuntu.com/security/CVE-2025-68142 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-68142 · Vendor Advisory
• https://github.com/facelessuser/pymdown-extensions · Note
• https://github.com/facelessuser/pymdown-extensions/commit/b50d15a56850ed1408a284bba81cc019c6bd72e8 · Note
• https://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-r6h4-mm7h-8pmq · Note
• https://pypi.org/project/pymdown-extensions/10.16.1 · Note
• https://redos.red-soft.ru/support/secure/uyazvimosti/support/secure/uyazvimosti-red-os-8-0/uyazvimost-python-pymdown-extensions-cve-2025-68142-8.0 · Note
• https://twitter.com/CVEnew/status/2001350876540342746 · Twitter Post