How secure is Fly.io?
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Short Answer
Fly.io gives you the primitives for a secure app (Supabase, managed auth, hosting), but every real-world Fly.io breach we track comes from missed configuration — not missing platform features. Secure-by-default it is not.
Detailed Answer
What Fly.io gives you out of the box
Fly.io enables global edge deployment with impressive simplicity. Edge deployments have unique security considerations around secrets and networking.
What Fly.io leaves to you
VAS helps verify your Fly.io deployment is secure regardless of which region serves the request.
The security gaps that actually appear in Fly.io apps
- **Secrets synchronization across regions** — A common failure mode in Fly.io applications: secrets synchronization across regions. Left unchecked, this can lead to data exposure, unauthorized access, or service abuse.
2. **Edge deployment security** — A common failure mode in Fly.io applications: edge deployment security. Left unchecked, this can lead to data exposure, unauthorized access, or service abuse.
3. **Private networking configuration** — A common failure mode in Fly.io applications: private networking configuration. Left unchecked, this can lead to data exposure, unauthorized access, or service abuse.
Platform security is strong where Fly.io controls the stack. The gaps above all sit in the application layer — where Fly.io's guarantees end and yours begin.
Verdict
Fly.io can be run securely. Treat "is Fly.io secure" as a deployment-time question, not a platform question: run a security scan, verify Row Level Security (RLS) policies are configured, and close the specific gaps above. Platforms with better defaults (e.g. enforced Row Level Security) would reduce the work — but none of them make scanning unnecessary.
Security Research & Statistics
of Lovable applications (170 out of 1,645) had exposed user data in the CVE-2025-48757 incident
Source: CVE-2025-48757 security advisory
average cost of a data breach in 2023
Source: IBM Cost of a Data Breach Report 2023
developers using vibe coding platforms like Lovable, Bolt, and Replit
Source: Combined platform statistics 2024-2025
Expert Perspectives
“There's a new kind of coding I call 'vibe coding', where you fully give in to the vibes, embrace exponentials, and forget that the code even exists.”
“Vibe coding your way to a production codebase is clearly risky. Most of the work we do as software engineers involves evolving existing systems, where the quality and understandability of the underlying code is crucial.”
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Is Fly.io secure enough for production?
Yes — once verified. The platform layer handles infrastructure reliably; the application layer (access controls, secrets, auth) is where production readiness is won or lost. Verification is a scan + manual review of Row Level Security (RLS) policies, not a vibe check.
What percentage of Fly.io apps have security issues before review?
Based on the breaches we track and community reporting, the majority of Fly.io apps deployed without a pre-launch scan have at least one critical or high-severity finding. The #1 recurring finding is "Secrets synchronization across regions". This is not unique to Fly.io — it's the base rate for AI-assisted development — but it means the default state of a shipped Fly.io app is "unverified."
Does Fly.io itself have security certifications (SOC 2, ISO 27001)?
Platform certifications from Fly.io apply to the Fly.io infrastructure — not to your app built with Fly.io. Even if Fly.io is SOC 2-compliant, your app can still leak data through misconfigured Row Level Security (RLS) policies, exposed secrets, or missing access checks. Compliance for your app is a separate effort; the platform's certifications are necessary but never sufficient.
Explore Related Resources
More on Fly.io Security
Every angle of Fly.io security — from the specific findings we detect to step-by-step fixes.
Fly.io Security Scanner
Hub page: scan your Fly.io app for vulnerabilities.
Fly.io Security Risks
Specific risks we find in Fly.io apps, with real-world examples.
Fly.io Security Issues
Issues grouped by severity with detection and fix steps.
Fly.io Best Practices
Remediation playbook derived from Fly.io's actual failure modes.
Is Fly.io Safe?
Honest assessment of Fly.io's production readiness.
Fly.io Security Checklist
Pre-launch checklist covering every finding class for Fly.io.
How to Secure Fly.io Apps
Step-by-step hardening guide for Fly.io deployments.
Can Fly.io Apps Be Hacked?
Attack vectors specific to Fly.io and how they get exploited.