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Next.js security posture

While Next.js provides robust defaults like automatic XSS protection and built-in CSRF measures for certain hooks, complex Server Action implementations and custom API routes often introduce critical security gaps in production environments.

2 linked rules in the directory.

Browse rulesGet guardrails →

Top risks for this stack

00 critical07 high
Next.js has a Middleware / Proxy bypass in App Router applications via segment-prefetch routes - Incomplete Fix Follow-UpHIGH

May 2026

Flagged as mitigated by linked rules — verify in Composer export.

Next.js vulnerable to Denial of Service via connection exhaustion in applications using Cache ComponentsHIGH

May 2026

Flagged as mitigated by linked rules — verify in Composer export.

Next.js vulnerable to cache poisoning in React Server Component responsesMEDIUM

May 2026

Flagged as mitigated by linked rules — verify in Composer export.

Next.js has a Middleware / Proxy bypass in App Router applications via segment-prefetch routesHIGH

May 2026

Flagged as mitigated by linked rules — verify in Composer export.

Next.js has a Middleware / Proxy bypass through dynamic route parameter injectionHIGH

May 2026

Flagged as mitigated by linked rules — verify in Composer export.

Facebook React has a Denial of Service Vulnerability in React Server ComponentsHIGH

May 2026

Flagged as mitigated by linked rules — verify in Composer export.

React Server Components have a Denial of Service VulnerabilityHIGH

Apr 2026

Flagged as mitigated by linked rules — verify in Composer export.

Next.js: Unbounded postponed resume buffering can lead to DoSHIGH

Mar 2026

Flagged as mitigated by linked rules — verify in Composer export.

What the framework handles

FeatureStatus
XSS PreventionBUILT-IN
Route ProtectionMANUAL CFG
CORS PolicyMANUAL CFG
Header SecurityBUILT-IN
Environment IsolationBUILT-IN

Rule coverage

TypeDescriptionExplore
Security patternsALWAYS/NEVER safe-coding directivesExplore →
Dependency alertsCVE advisories for this stack's packagesExplore →