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Next.js vs Flask

Security & risk comparison · Updated June 2026

How does Next.js compare to Flask 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

Next.js scores 81/100 overall versus Flask's 63/100. Next.js has 25 total CVEs compared to Flask's 30, giving it a smaller vulnerability surface. (Source: WebPulse framework scoring, NVD/NIST, July 2026)

81
Next.js
Modern · JAVASCRIPT
vs
63
Flask
Modern · PYTHON
Dimension-by-dimension breakdown
security Next.js
82
75
Next.js
Flask
performance Tie
65
65
Next.js
Flask
ecosystem Next.js
90
50
Next.js
Flask
ai readiness Next.js
88
70
Next.js
Flask
developer experience Next.js
85
70
Next.js
Flask
market trajectory Next.js
85
40
Next.js
Flask
cost of ownership Next.js
75
60
Next.js
Flask
Security details
Metric Next.js Flask
Total CVEs 25 30
Critical CVEs 2 3
Exploited (KEV) 0 0
CVEs last year 8 5
Avg CVSS 4.5 4.8
Security score 82/100 75/100
Recommended
Next.js

Next.js scores 81/100. Verdict: Recommended.

Acceptable
Flask

Flask scores 64/100. Verdict: Acceptable.

Quick facts
Next.js
Category: Fullstack
Language: JAVASCRIPT
First release: 2016
Generation: Modern
Trend: Rising
Market share: 3.5%
Flask
Category: Backend
Language: PYTHON
First release: 2010
Generation: Modern
Trend: Stable
Market share: 0.5%
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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.