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Flask vs React

Security & risk comparison · Updated June 2026

How does Flask compare to React on security, AI-readiness, and total cost of ownership? We scored both across 7 dimensions using NVD/NIST CVE data, GitHub metrics, and our scan of 10M+ sites.

Key finding

React scores 71/100 overall versus Flask's 63/100. React has 20 total CVEs compared to Flask's 30, giving it a smaller vulnerability surface. (Source: WebPulse framework scoring, NVD/NIST, July 2026)

63
Flask
Modern · PYTHON
vs
71
React
Modern · JAVASCRIPT
Dimension-by-dimension breakdown
security React
75
80
Flask
React
performance Tie
65
65
Flask
React
ecosystem React
50
82
Flask
React
ai readiness Flask
70
55
Flask
React
developer experience Tie
70
70
Flask
React
market trajectory React
40
90
Flask
React
cost of ownership Flask
60
55
Flask
React
Security details
Metric Flask React
Total CVEs 30 20
Critical CVEs 3 2
Exploited (KEV) 0 0
CVEs last year 5 3
Avg CVSS 4.8 4.5
Security score 75/100 80/100
Acceptable
Flask

Flask scores 64/100. Verdict: Acceptable.

Acceptable
React

React scores 72/100. Verdict: Acceptable.

Quick facts
Flask
Category: Backend
Language: PYTHON
First release: 2010
Generation: Modern
Trend: Stable
Market share: 0.5%
React
Category: Frontend
Language: JAVASCRIPT
First release: 2013
Generation: Modern
Trend: Rising
Market share: 8.0%
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Data sourced from NVD/NIST CVE database, GitHub API, and WebPulse framework scanner. Scores calculated using a 7-dimension model covering security, performance, ecosystem health, AI-readiness, developer experience, market trajectory, and cost of ownership. Updated June 2026.