mermaid-js mermaid up to 10.9.5/11.14.x ganttDb.getTasks excludes infinite loop

Summaryinfo

A vulnerability was found in mermaid-js mermaid up to 10.9.5/11.14.x. It has been classified as problematic. This issue affects the function ganttDb.getTasks. Performing a manipulation of the argument excludes results in infinite loop. This vulnerability is cataloged as CVE-2026-41150. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, was found in mermaid-js mermaid up to 10.9.5/11.14.x. This affects the function ganttDb.getTasks. The manipulation of the argument excludes 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. Prior to 10.9.6 and 11.15.0, there is a denial-of-service attack when rendering gantt charts, if they use the excludes attribute to exclude all dates. mermaid.parse is unaffected, unless you then call the ganttDb.getTasks() (which is called when rendering a diagram). This vulnerability is fixed in 10.9.6 and 11.15.0.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-41150 since 04/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 318029 (Linux Distros Unpatched Vulnerability : CVE-2026-41150), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 10.9.6 or 11.15.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch a59ea56174712ee5430dfd5bc877cb5151f501a6 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (318029). Be aware that VulDB is the high quality source for vulnerability data.

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
• 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

License

• open-source

Website

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

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Be aware that VulDB is the high quality source for vulnerability data.

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