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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-64649)

The Next.js Framework on the remote host is affected by a server-side request forgery vulnerability:

  - 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 is also possible to obtain internal values     that weaken middleware/proxy authorization. (CVE-2026-64649)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
455322	Echo: next: security update to 15.5.21	Tenable Cloud Security	Echo Local Security Checks	Local	high
455322	Echo: next: security update to 15.5.21	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
330088	Next.js Framework 14.1.1 < 15.5.21 / 16.x < 16.2.11 SSRF	Nessus	Misc.	Local	high
445132	SCA: security update for next (GHSA-89xv-2m56-2m9x)	Tenable Cloud Security	SCA Checks	Local	high
445132	SCA: security update for next (GHSA-89xv-2m56-2m9x)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2026-64649

high

Tenable Plugins

high

high

high

high

high