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Advisories

python-markdown2 through 2.5.5 Denial of Service via Unclosed Inline Link Destinations

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Severity
high
Date
Affecting

  • python-markdown2 <= 2.5.5

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
Muhammadyusuf Dilmurodov (agrresore), ParamTanna
Description
python-markdown2 through 2.5.5 contains a denial of service vulnerability that allows remote users to exhaust CPU by submitting Markdown with unclosed inline link destinations. Attackers can submit repeated '[a](' or '![a](' sequences, causing _find_balanced to rescan the remaining document for each link and consume quadratic CPU time.

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