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CVE-2026-64649

Next.js: Server-Side Request Forgery in Server Actions on Custom Servers PUBLISHED

Description (CNA)

Next.js is a React framework for building full-stack web applications. In versions 14.1.1 through 15.5.20 and 16.0.0 through 16.2.10, when a Server Action forwards or redirects a request, an attacker can cause the server to send that outbound request to a malicious host (Server-Side Request Forgery). This requires the attacker's request to control Host-associated headers. In some configurations, it's also possible to obtain internal values that weaken middleware/proxy authorization. Applications that use Server Actions are affected when the incoming host header is not fixed to a trusted value. This typically occurs on custom servers, or on deployments not behind a proxy that pins the host. Managed hosting pins the host upstream and is not affected; next start and standalone output do the same from version 14.2 onward. This issue has been fixed in versions 15.5.21 and 16.2.11.

Affected (CNA)

Vendor / productVersions
vercel / next.jsaffected >= 14.1.1, < 15.5.21; affected >= 16.0.0 < 16.2.11

CWE

CWE-918

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.