mermaid-js Mermaid up to 10.9.7/11.16.0 XY Charts setXAxisRangeData infinite loop

Summaryinfo

A vulnerability marked as problematic has been reported in mermaid-js Mermaid up to 10.9.7/11.16.0. This impacts the function setXAxisRangeData of the component XY Charts. Performing a manipulation results in infinite loop. This vulnerability is identified as CVE-2026-71436. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as problematic has been found in mermaid-js Mermaid up to 10.9.7/11.16.0. This affects the function setXAxisRangeData of the component XY Charts. The manipulation with an unknown input leads to a infinite loop vulnerability. CWE is classifying the issue as CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. This is going to have an impact on availability. The summary by CVE is:

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 10.6.0 until 10.9.8 and 11.16.1, Mermaid XY Charts are vulnerable to an infinite loop denial of service in the setXAxisRangeData function when configuring an X-Axis with invalid parameters. Because each loop iteration appends an element to an array, this generally causes a RangeError to appear after a few seconds, but it may instead cause the page or JavaScript process to crash from memory exhaustion, depending on the environment. This issue is fixed in versions 10.9.8 and 11.16.1.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-71436 since 08/06/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 10.9.8 or 11.16.1 eliminates this vulnerability.

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Productinfo

Vendor

• mermaid-js

Name

• Mermaid

Version

• 10.9.0
• 10.9.1
• 10.9.2
• 10.9.3
• 10.9.4
• 10.9.5
• 10.9.6
• 10.9.7
• 11.0
• 11.1
• 11.2
• 11.3
• 11.4
• 11.5
• 11.6
• 11.7
• 11.8
• 11.9
• 11.10
• 11.11
• 11.12
• 11.13
• 11.14
• 11.15
• 11.16.0

Website

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

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