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Advisories

Mistune before 3.3.0 Quadratic-Time DoS via Unmatched Brackets in Inline Parser

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Severity
high
Date
Affecting

  • mistune >= 0, < 3.3.0

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
offset
Description
Mistune before 3.3.0 contains an algorithmic complexity vulnerability in the inline link parser that allows unauthenticated attackers to exhaust CPU by submitting long runs of unmatched '[' characters. Attackers can send small markdown payloads that trigger O(N^2) parse_link_text and parse_link_label probing, occupying rendering workers for 30+ seconds per 16 KB input.

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