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CVE-2026-111758

CVE-2026-111758 · markdown-it: Quadratic-time rendering of a single multi-line link reference definition with default options (regression since 14.0)

This page contains facts from public vulnerability sources. Check the original advisory before updating.

markdown-it is a Markdown parser. From versions 14.1.0 to before 14.3.3, and 15.0.0 to before 15.0.3, a link reference definition whose label or title is never closed is O(n²) with default options. Continuation lines are pulled lazily with str += lineContent in src/rules_block/reference.ts, and the subsequent charCodeAt and slice calls flatten the V8 cons-string, copying everything collected so far; this runs before the rule decides the definition is invalid. No options are required to trigger it. This issue has been patched in versions 14.3.3 and 15.0.3.

CVSS 7.5 · High · EPSS 0.5% · Public exploit · Fix available

Published
Updated

Stack: system · node

Affected products and versions

  • markdown-it

    Versions
    • >= 14.1.0, < 14.3.3: Affected
    • >= 15.0.0, < 15.0.3: Affected

    No fix published

  • markdown-it npm

    Affected ranges
    • SEMVER: ≥ 14.1.0, < 14.3.3

    Update to 14.3.3

  • markdown-it npm

    Affected ranges
    • SEMVER: ≥ 15.0.0, < 15.0.3

    Update to 15.0.3

  • node-markdown-it Ubuntu:22.04:LTS

    Versions
    • 10.0.0+dfsg-2
    • 10.0.0+dfsg-3
    • 10.0.0+dfsg-3.1
    • 10.0.0+dfsg-4
    • 10.0.0+dfsg-5
    • 10.0.0+dfsg-6
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-markdown-it Ubuntu:24.04:LTS

    Versions
    • 22.2.3+dfsg+~12.2.3-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-markdown-it Ubuntu:26.10

    Versions
    • 22.2.3+dfsg+~12.2.3-4
    • 22.2.3+dfsg+~12.2.3-5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-markdown-it Ubuntu:26.04:LTS

    Versions
    • 22.2.3+dfsg+~12.2.3-2
    • 22.2.3+dfsg+~12.2.3-4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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