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    CVE-2026-115347

    Mistune before 3.3.0 contains an inefficient algorithmic complexity vulnerability in parse_link_text that allows remote attackers to cause denial of service through unbalanced square brackets. Attackers can submit markdown containing long runs of unmatched brackets to mistune.html(), triggering repeated forward scans that stall worker processes for minutes.

    Published:Oct 22, 2026
    Last Modified:Oct 26, 2026
    EPS:Oct 22, 2026
    EPSS Score:0.0041
    CVSS Score:7.5

    Affected Products

    Vendor
    Mistune Project
    Product
    Mistune

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-115352 (CVSS 8.7) — Mistune before 3.3.0 contains an algorithmic complexity vulnerability in the inline link parser that allows un…
    CVE-2026-115351 (CVSS 5.3) — Mistune from 3.2.1 before 3.3.0 contains a CSS injection vulnerability that allows attackers controlling markd…
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    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