medium

CVE-2026-71439

npm · mermaid

Summary

Mermaid radar diagrams are vulnerable to DoS

Severity
medium
EPSS
0.5% (p44)
CWE
CWE-606, CWE-1322
Also known as
GHSA-rhh3-jpg6-66xh
Published
2026-08-06
Updated
2026-08-06

Advisory details

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

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?

References

Related advisories

Is your project exposed to this? Stateward checks every dependency on every pull request and flags it only if your code actually reaches it.

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.