GitHub Advisoryadvisory · npm
GHSA-rhh3-jpg6-66xh Mermaid radar diagrams are vulnerable to DoS
MEDIUM
Official page ↗
- Aliases
- CVE-2026-71439
- Ecosystem
- npm
- Packages
- mermaid
- Severity
- Moderate
- CVSS vector
- 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
- Weaknesses
- CWE-1322, CWE-606
- Reviewed
- 2026-08-06
Affected packages
• npm mermaid: >= 11.6.0, < 11.16.1 → fixed in 11.16.1
Description
Impact
Mermaid radar diagrams allow arbitrary large values for `ticks`, which can cause high CPU usage, freezing the webpage/JavaScript process for long periods of time, until the process is eventually killed due to OOM/running out of memory.
Proof-of-concept
```txt
radar-beta
axis a, b
curve c {1, 1}
ticks 1000000000
```
Patches
_Has the problem been patched? What versions should users upgrade to?_
This problem has been patched by https://github.com/mermaid-js/mermaid/commit/59b22fad2b3bb04f87a476c84a8a2b24679e607e, which was released in Mermaid v11.16.1
Workarounds
_Is there a way for users to fix or remediate the vulnerability without upgrading?_
There are no known workarounds without updating to a patched version of mermaid.
References
_Are there any links users can visit to find out more?_
• https://github.com/mermaid-js/mermaid/commit/59b22fad2b3bb04f87a476c84a8a2b24679e607e
• https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.16.1
Related
Alias · CVE (1)
- CVE-2026-71439 Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. vulnerability
References
- https://github.com/mermaid-js/mermaid/security/advisories/GHSA-rhh3-jpg6-66xh web
- https://github.com/mermaid-js/mermaid/pull/8022 web
- https://github.com/mermaid-js/mermaid/commit/59b22fad2b3bb04f87a476c84a8a2b24679e607e web
- https://github.com/mermaid-js/mermaid package
- https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.16.1 web