Incorrect sanitisation function leads to `XSS` in mermaid

Description

Malicious diagrams can contain javascript code that can be run at diagram readers machines.

Recommendation

Update the mermaid package to the latest compatible version. Followings are version details:

• Affected version(s): < 8.13.8
• Patched version(s): 8.13.8

References

• GHSA-p3rp-vmj9-gv6v
• CVE-2021-43861
• CWE-20
• CWE-79
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• Finance.js vulnerable to DoS via the seekZero() parameter - CVE-2025-56572
• Mermaid does not properly sanitize architecture diagram iconText leading to XSS - CVE-2025-54880
• jsPDF Bypass Regular Expression Denial of Service (ReDoS) - CVE-2025-29907
• Prototype pollution vulnerability found in Mermaid's bundled version of DOMPurify - Vulnerability

Tags:

npm

mermaid