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mermaid-js/mermaid · Security

Mermaid Gantt Charts are vulnerable to an Infinite Loop DoS

GHSA ID
GHSA-6m6c-36f7-fhxh
CVE ID
CVE-2026-41150
Severity
medium
Published
Updated
CVSS
5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v3
5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4
5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L

Description

Impact

Mermaid v11.14.0 and earlier are vulnerable to a denial-of-service attack when rendering gantt charts, if they use the excludes attribute to exclude all dates.

Example:

gantt
  excludes monday,tuesday,wednesday,thursday,friday,saturday,sunday
  DoS :2025-01-01, 1d

mermaid.parse is unaffected, unless you then call the ganttDb.getTasks() (which is called when rendering a diagram).

Patches

This has been patched in:

Workarounds

There are no workarounds available without updating to a newer version of mermaid.

CWEs

  • CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')

References