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    CVE-2019-25781

    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.

    Published:Oct 29, 2026
    Last Modified:Nov 3, 2026
    EPS:Oct 29, 2026
    EPSS Score:0.00422
    CVSS Score:7.5

    Affected Products

    Vendor
    Python-markdown
    Product
    Markdown
    Vendor
    Python-markdown2 Project
    Product
    Python-markdown2

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High