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    CVE-2026-115349

    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.

    Published:Oct 22, 2026
    Last Modified:Oct 26, 2026
    EPS:Oct 22, 2026
    EPSS Score:0.00344
    CVSS Score:7.5

    Affected Products

    Vendor
    Lepture
    Product
    Mistune
    Vendor
    Mistune Project
    Product
    Mistune

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-492 Regular Expression Exponential Blowup

    Related CVEs

    CVE-2026-121438 (CVSS 6.9) — Mistune before 3.3.3 contains a denial of service vulnerability in InlineParser.parse_link that allows attacke…
    CVE-2026-115353 (CVSS 9.2) — Mistune before 3.3.0 contains a path traversal vulnerability in the RST include directive that allows attacker…
    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…
    CVE-2026-76098 (CVSS 7.5) — Mistune is a Python Markdown parser with renderers and plugins. Versions 3.3.0 through 3.3.2 are vulnerable to…
    CVE-2026-59927 (CVSS 5.3) — Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the Include directive in src/m…
    CVE-2026-59928 (CVSS 7.5) — Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a Markdown document containing…
    CVE-2026-59924 (CVSS 5.9) — Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Include.parse() joins and norm…
    CVE-2026-59929 (CVSS 6.1) — Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the safe_url filter in src/mis…
    CVE-2026-59925 (CVSS 7.5) — Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, long sequences of well-formed …
    CVE-2026-59926 (CVSS 5.3) — Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, render_admonition() in src/mis…

    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