PT-2026-132110

CVE-2019-25781

Published

2026-10-29

Updated

2026-10-29

Description by

CVSS 4.0

8.7

High

MetricsAV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions Python-Markdown versions 3.0 through 3.11.2

Description An algorithmic complexity issue exists in inline link parsing. Remote attackers can cause CPU exhaustion by submitting short Markdown content containing repeated [ or ![ characters. This forces the getText() and getLink() functions within LinkInlineProcessor into quadratic scans, which can keep worker processes busy for several minutes.

Recommendations Update Python-Markdown to a version later than 3.11.2.

Exploitability

Exploit

Fix

Researchers

Anders Kaseorg

Muhammadyusuf Dilmurodov

Vendors

Affected products

Weakness enumeration

CWE-407: Inefficient Algorithmic Complexity

Related identifiers