CVE-2026-71439

Mermaid radar diagrams are vulnerable to DoS

State: Published
Severity: 5.3 Medium
Published: Aug 6, 2026
Updated: Aug 7, 2026
Reserved: Aug 6, 2026

Description

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 11.6.0 until 11.16.1, Mermaid Radar Diagrams allow arbitrary large values for the ticks parameter, which can cause high CPU usage and freeze the rendering webpage or JavaScript process for long periods of time, potentially until the process is killed from memory exhaustion. This issue is fixed in version 11.16.1.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	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	GitHub_M

Weaknesses

CWE-606 Unchecked Input for Loop Condition
CWE-1322 Use of Blocking Code in Single-threaded, Non-blocking Context

Affected Products

Product	Versions
mermaidmermaid-js	>= 11.6.0, < 11.16.1Affected

References

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