CVE-2026-71439
mediumpriority · track · 0EPSS 0.005 · 44 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 1.3–5.3
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- GHSA-rhh3-jpg6-66xhMermaid radar diagrams are vulnerable to DoS2026-08-06ghsa · osvUS
### Impact Mermaid radar diagrams allow arbitrary large values for `ticks`, which can cause high CPU usage, freezing the webpage/JavaScript process for long periods of time, until the process is eventually killed due to OOM/running out of memory. #### Proof-of-concept ```txt radar-beta axis a, b curve c {1, 1} ticks 1000000000 ``` ### Patches _Has the problem been patched? What versions should users upgrade to?_ This problem has been patched by https://github.com/mermaid-js/mermaid/commit/59b22fad2b3bb04f87a476c84a8a2b24679e607e, which was released in [Mermaid v11.16.1](https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.16.1) ### Workarounds _Is there a way for users to fix or remediate the vulnerability without upgrading?_ There are no known workarounds without updating to a patched version of mermaid. ### References _Are there any links users can visit to find out more?_ - https://github.com/mermaid-js/mermaid/commit/59b22fad2b3bb04f87a476c84a8a2b24679e607e - https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.16.1
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (13)
External citations — patches, advisories, analysis.
- https://github.com/mermaid-js/mermaid/commit/59b22fad2b3bb04f87a476c84a8a2b24679e607ecnnvd
- https://github.com/mermaid-js/mermaid/pull/8022cnnvd
- https://github.com/mermaid-js/mermaid/releasesPatchcnnvd
- https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.16.1cnnvd
- https://github.com/mermaid-js/mermaid/security/advisories/GHSA-rhh3-jpg6-66xhcnnvd
- https://github.com/mermaid-js/mermaid/commit/59b22fad2b3bb04f87a476c84a8a2b24679e607eenisa_euvd
- https://github.com/mermaid-js/mermaid/pull/8022enisa_euvd
- https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.16.1enisa_euvd
Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.
Free scan