What’s Vulnerable › Vulnerabilities

CVE-2026-41150: Mermaid Gantt Charts are vulnerable to an Infinite Loop DoS

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-29 · updated 2026-07-21
• Weakness: CWE-835

Description

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Prior to 10.9.6 and 11.15.0, there is a denial-of-service attack when rendering gantt charts, if they use the excludes attribute to exclude all dates. mermaid.parse is unaffected, unless you then call the ganttDb.getTasks() (which is called when rendering a diagram). This vulnerability is fixed in 10.9.6 and 11.15.0.

Affected products

• mermaid-js mermaid: before 10.9.6; from 11.0.0 before 11.15.0 — fixed in 10.9.6, 11.15.0

How to fix

Upgrade to a fixed version: mermaid-js mermaid 10.9.6, 11.15.0. Check the vendor advisory for mitigations.

References

• https://github.com/mermaid-js/mermaid/commit/a59ea56174712ee5430dfd5bc877cb5151f501a6
• https://github.com/mermaid-js/mermaid/commit/faafb5d49106dd32c367f3882505f2dd625aa30e
• https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0
• https://github.com/mermaid-js/mermaid/releases/tag/v10.9.6
• https://github.com/mermaid-js/mermaid/security/advisories/GHSA-6m6c-36f7-fhxh
• https://github.com/mermaid-js/mermaid/security/advisories/GHSA-6m6c-36f7-fhxh

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