Mcp Defender
MCP-Defender/MCP-DefenderAGPL-3.0⭐ 246🔧 1 tools
F1.6SpiderScore (registry)
⚠ Hard constraint applied: critical vulnerability
Decision
Not Recommended
Confidence
90%
Mcp Defender is not recommended — low score (1.57/10) with 1 critical issues.
Recommended Actions
- highRun In Container1 critical vulnerabilities require isolation
- highLimit PermissionsRestrict tool access to minimum required scope
Do Not
- ✗running in production without container isolation
- ✗using for security-sensitive tasks
Risk Flags (4)
- criticalchild_process_injectionCommand injection — execSync() with non-literal command
- hights_token_leakageSecret or token may be leaked through error messages, logs, or return values
- hightoken_leakage×7Secret or token may be leaked through error messages, logs, or return values
- hights_path_traversal×2Potential path traversal -- user input used in file system operations
How This Was Decided
- negativew=0.5Overall quality score = 1.57/10 (grade F)
- negativew=0.81 critical security issue(s) detected
- negativew=0.510 high-severity issue(s) detected
- negativew=0.3Tool description clarity score = 0.9/10
Source: SpiderRating automated security scanUpdated: 2026-03-21Protocol: v1.1
Description Quality
Composite: 0.9 / 10
3-Layer Breakdown
Description (38%)
0.9
Security (34%)
6.0
Metadata (28%)
7.1
Description Dimensions
Intent Clarity
0.0
Permission Scope
0.0
Side Effects
2.0
Capability Disclosure
2.0
Operational Boundaries
0.8
Security Analysis
6.0
Score
1
Critical
10
High
0
Medium
0
Low
Findings Redacted
Detailed security findings are hidden during the 90-day responsible disclosure window. Maintainers have been notified.
1 CRITICAL10 HIGH
Metadata Health
Provenance (40%)
10.0
Maintenance (35%)
4.0
Popularity (25%)
6.9
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