CVE-2026-41150 Mermaid Gantt Charts are vulnerable to an Infinite Loop DoS
An attacker can cause a denial of service in Mermaid by crafting a Gantt chart that triggers an infinite loop during rendering.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-41150?
CVE-2026-41150 is a medium-severity denial of service vulnerability in mermaid-js mermaid, published on 29 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-835
Which versions are affected by CVE-2026-41150?
4 open source packages ship an affected version, including mermaid. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mermaid npm | All versions | 10.9.6 |
mermaid npm | All versions | 10.9.6 |
mermaid npm | From 11.0.0-alpha.1 | 11.15.0 |
mermaid npm | From 11.0.0-alpha.1 | 11.15.0 |
Products include Mermaid Project Mermaid.
How do I fix CVE-2026-41150?
Upgrade mermaid to a fixed version for your release line: 10.9.6 or 11.15.0.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-41150 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41150 exists.
Other vulnerabilities in mermaid-js mermaid
- CVE-2021-43861 Incorrect sanitisation function leads to `XSS`
- CVE-2021-35513 Cross-site Scripting in Mermaid
- CVE-2026-41159 Mermaid: Improper sanitization of configuration leads to CSS injection
- CVE-2025-54880 Mermaid does not properly sanitize architecture diagram iconText leading to XSS
- CVE-2022-31108 Arbitrary `CSS` injection into the generated graph affecting the container HTML in mermaid.js
Sources
Also known as DEBIAN-CVE-2026-41150, GHSA-6m6c-36f7-fhxh, MINI-53mm-55gm-wj49, MINI-mm89-8xhw-wm72, UBUNTU-CVE-2026-41150.