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CVE-2026-71437

CVE-2026-71437 · Mermaid Architecture diagrams are vulnerable to prototype pollution

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

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 11.5.0 until 11.16.1, Mermaid Architecture Diagrams are vulnerable to prototype pollution when a diagram defines a group with an id of __proto__. Because the group id is used directly as an object property key without validation, an attacker who can supply diagram text can pollute Object.prototype, potentially affecting the behavior of the embedding application. This issue is fixed in version 11.16.1.

CVSS 6.5 · Medium · EPSS 0.5% · Fix available

Published
Updated

Stack: system · node

Affected products and versions

  • mermaid

    Versions
    • >= 11.5.0, < 11.16.1: Affected

    No fix published

  • node-mermaid Debian:14

    Versions
    • 8.11.0+ds+~cs29.13.22-1
    • 8.13.2+ds+~cs30.13.21-1
    • 8.13.2+ds+~cs30.13.21-1.1
    • 8.13.3+ds+~cs26.13.21-1
    • 8.13.3+ds+~cs26.13.21-2
    • 8.13.8+~cs10.4.16-1
    • 8.14.0+ds1+~cs11.4.14-1
    • 8.14.0+~cs11.4.14-1
    • 8.7.0+ds+~cs27.17.17-1
    • 8.7.0+ds+~cs27.17.17-2
    • 8.7.0+ds+~cs27.17.17-2~bpo10+1
    • 8.7.0+ds+~cs27.17.17-3
    • 8.9.1+ds+~cs26.20.25-1
    • 8.9.3+ds+~cs29.13.19-1
    • 9.2.2+~2.0.0-1
    • 9.2.2+~2.0.0-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • mermaid npm

    Affected ranges
    • SEMVER: ≥ 11.5.0, < 11.16.1

    Update to 11.16.1

  • node-mermaid Ubuntu:22.04:LTS

    Versions
    • 8.7.0+ds+~cs27.17.17-3
    • 8.13.3+ds+~cs26.13.21-1
    • 8.13.3+ds+~cs26.13.21-2
    • 8.13.8+~cs10.4.16-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-mermaid Ubuntu:26.10

    Versions
    • 9.2.2+~2.0.0-1
    • 9.2.2+~2.0.0-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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