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Advisories

Mistune 3.0.0 before 3.3.0 Denial of Service via Nested Bracket Parsing

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Severity
high
Date
Affecting

  • mistune >= 3.0.0, < 3.3.0

CWE
  • CWE-1333 Inefficient Regular Expression 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
dapickle
Description
Mistune from 3.0.0 before 3.3.0 contains an algorithmic complexity denial of service vulnerability in the parse_link_text function in src/mistune/helpers.py. Attackers can submit markdown with deeply nested square brackets triggering quadratic parsing time, exhausting server CPU with small crafted requests.

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