Is mermaid affected by CVE-2026-41149?

npm mermaid is affected in >=11.0.0-alpha.1 <11.15.0, <10.9.6.

Is CVE-2026-41149 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.5%.

medium

CVE-2026-41149

Q: Is CVE-2026-41149 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.5%.

npm · mermaid

Summary

Mermaid: Improper sanitization of `classDef` in state diagrams leads to HTML injection

Severity: medium
EPSS: 0.5% (p40)
Also known as: GHSA-ghcm-xqfw-q4vr
Published: 2026-05-11

References

https://github.com/mermaid-js/mermaid/security/advisories/GHSA-ghcm-xqfw-q4vr
https://nvd.nist.gov/vuln/detail/CVE-2026-41149
https://github.com/mermaid-js/mermaid/commit/37ff937f1da2e19f882fd1db01235db4d01f4056

Related advisories

CVE-2026-41159 — medium · npm/mermaid
CVE-2026-41150 — medium · npm/mermaid
CVE-2026-41148 — medium · npm/mermaid

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.