DEBIAN-CVE-2026-86430

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    DEBIAN-CVE-2026-86430

    Published: 7 Sept 2026Last Modified: 11 Sept 2026
    Upstream:
    CVE-2026-86430

    Summary:

    Details: league/commonmark versions before 2.9.1 contain multiple denial of service vulnerabilities in fenced code block detection, reference link label lookup, and emphasis delimiter processing that perform super-linear work on crafted input. Attackers can submit specially crafted Markdown with long backtick runs, nested brackets, or delimiter sequences to consume disproportionate CPU time and prevent legitimate requests from completing.

    References: https://security-tracker.debian.org/tracker/CVE-2026-86430

    Affected packages

    Package

    Name: php-league-commonmark

    Purl: pkg:deb/debian/php-league-commonmark?arch=source&distro=bookworm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    2.10.0-1

    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
    DEBIAN-CVE-2026-86430 | CVE-DB