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Advisories

Python-Markdown 3.0 through 3.11.2 Denial of Service via Link Bracket Parsing

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Severity
high
Date
Affecting

  • Markdown >= 3.0, <= 3.11.2

CWE
  • CWE-407 Inefficient Algorithmic Complexity
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
Anders Kaseorg, Muhammadyusuf Dilmurodov (agrresore)
Description
Python-Markdown 3.0 through 3.11.2 contains an algorithmic complexity vulnerability in inline link parsing that allows remote attackers to exhaust CPU through unmatched brackets. Attackers can submit short Markdown containing repeated [ or ![ characters, forcing LinkInlineProcessor.getText() and getLink() into quadratic scans that keep workers busy for minutes.

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