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Advisories

Mistune 3.3.0 before 3.3.4 Quadratic-Time DoS via _process_emphasis_delimiters

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Severity
high
Date
Affecting

  • mistune >= 3.3.0, < 3.3.4

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
manus-use
Description
Mistune from 3.3.0 before 3.3.4 contains a denial of service vulnerability that allows remote attackers to exhaust CPU through quadratic-time emphasis delimiter processing. Attackers can submit small markdown documents with repeated patterns like "*a_b" to trigger an O(n²) index-fixup loop, stalling workers for seconds.

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