CVE-2026-71439: medium-severity vulnerability in mermaid-js mermaid
Mermaid radar diagrams are vulnerable to DoS
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.5%
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:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L
Affected products
mermaid-js · mermaidRelated CVEs — mermaid-js mermaid
In the same product, most dangerous first.
CVE-2021-43861HIGHIncorrect sanitisation function leads to `XSS`EPSS 0.9%CVE-2022-31108MEDIUMArbitrary `CSS` injection into the generated graph affecting the container HTML in mermaid.jsEPSS 0.9%CVE-2025-54881MEDIUMMermaid improperly sanitizes of sequence diagram labels leading to XSSEPSS 0.8%CVE-2026-50159MEDIUMMermaid allows CSS injection applying to sibling elements of the diagramEPSS 0.6%CVE-2026-71436MEDIUMMermaid XY Charts are vulnerable to an infinite loop DoSEPSS 0.6%CVE-2026-71437MEDIUMMermaid Architecture diagrams are vulnerable to prototype pollutionEPSS 0.5%