Signal
Multiple medium-severity vulnerabilities disclosed in Mermaid diagramming tool
Evidence first: scan the strongest sources, then decide whether to go deeper.
Published 2026-05-11 19:36 UTCUpdated 2026-05-11 19:37 UTC
github
cveexploitssecurity_tooling
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Evidence trail (top sources)
top sources (1 domains)domains are deduped. counts indicate coverage, not truth.1 top source shown
limited source diversity in top sources
Overview
Four medium-severity security advisories have been published for the Mermaid diagramming tool, detailing improper sanitization issues leading to CSS and HTML injection, as well as an infinite loop denial-of-service vulnerability affecting Gantt charts.
Entities
Mermaid
Score total
0.93
Momentum 24h
4
Posts
4
Origins
1
Source types
1
Duplicate ratio
0%
Why now
- The advisories were published recently, indicating fresh risks to Mermaid users.
- Mermaid is widely used in documentation and development workflows, increasing potential impact.
- Early awareness helps organizations prioritize updates and mitigate threats promptly.
Why it matters
- Improper sanitization vulnerabilities can enable attackers to inject malicious CSS or HTML, compromising user security.
- Infinite loop DoS in Gantt charts can disrupt services relying on Mermaid for diagram rendering.
- Prompt patching is essential to prevent exploitation of these vulnerabilities.
LLM analysis
Topic mix: lowPromo risk: lowSource quality: high
Recurring claims
- Mermaid diagramming tool suffers from improper sanitization leading to CSS and HTML injection vulnerabilities.
- Mermaid Gantt charts are vulnerable to an infinite loop denial-of-service attack.
How sources frame it
- Github_advisories: neutral
This briefing consolidates multiple related advisories on Mermaid vulnerabilities to provide a clear, concise update for security teams.
All evidence
All evidence
Mermaid: Improper sanitization of configuration leads to CSS injection
github_advisories · github.com · 2026-05-11 19:37 UTC
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Posts loaded: 0Publishers: 1Origin domains: 1Duplicates: -
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Top publishers (this list)
- github_advisories (1)
Top origin domains (this list)
- github.com (1)