DEBIAN-CVE-2026-86433

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    DEBIAN-CVE-2026-86433

    Published: 7 Sept 2026Last Modified: 9 Sept 2026
    Upstream:
    CVE-2026-86433

    Summary:

    Details: commonmark versions from 1.5.0 before 2.8.4 contain a denial of service vulnerability in the Attributes extension where AttributesListener::findTargetAndDirection() performs quadratic-time sibling list scanning. Unauthenticated attackers can submit approximately 32 KB of repeated attribute blocks to cause parsing to take over 5 seconds, exhausting server resources.

    References: https://security-tracker.debian.org/tracker/CVE-2026-86433

    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-2026-86433 | CVE-DB