CVE-2026-41148
medium
CVSS v3
—
CVSS v4 NEW
5.3
VIR risk
5.5
Description
Mermaid: Improper sanitization of `classDefs` in diagrams leads to CSS injection
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bullseye | affected | |
References
- https://github.com/mermaid-js/mermaid/security/advisories/GHSA-xcj9-5m2h-648r
- https://github.com/mermaid-js/mermaid/commit/8fead23c59166b7bab6a39eac81acebee2859102
- https://github.com/mermaid-js/mermaid/commit/e9b0f34d8d82a6260077764ee45e1d7d90957a0f
- https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0
- https://github.com/mermaid-js/mermaid/releases/tag/v10.9.6
- https://mermaid.js.org/config/schema-docs/config.html#securitylevel
- https://github.com/mermaid-js/mermaid
- https://security-tracker.debian.org/tracker/CVE-2026-41148
- https://github.com/advisories/GHSA-xcj9-5m2h-648r
CWEs
CWE-94
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.