mermaid-js Mermaid up to 11.16.0 Radar Diagrams ticks resource consumption

Summaryinfo

A vulnerability classified as problematic was found in mermaid-js Mermaid. Affected by this issue is some unknown functionality of the component Radar Diagrams. The manipulation of the argument ticks results in resource consumption. This vulnerability is cataloged as CVE-2026-71439. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in mermaid-js Mermaid. Affected is an unknown function of the component Radar Diagrams. The manipulation of the argument ticks with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-71439 since 08/06/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 11.16.1 eliminates this vulnerability.

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Productinfo

Vendor

• mermaid-js

Name

• Mermaid

Version

• 10.9.6
• 10.9.8
• 11.10.0
• 11.14
• 11.15.0
• 11.16.0

Website

• Product: https://github.com/mermaid-js/mermaid/

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