Next.js is a React framework for building full-stack web applications. In versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10, Next.js applications using App Router, Server Actions (use server) or use cache endpoints can be disclosed bypassing any authentication on the pages where these endpoints are usually used. Server Action IDs can be disclosed to unauthenticated users via publicly served client artifacts (for example, static chunks containing action references). Affected users are applications using App Router and Server Actions. By itself, this disclosure is typically a recon/enumeration primitive; however, it can increase risk when combined with other weaknesses. 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 12.0.0 through 15.5.20
    and 16.0.0 through 16.2.10, Next.js applications using App Router, Server Actions (use server) or use
    cache endpoints can be disclosed bypassing any authentication on the pages where these endpoints are
    usually used. Server Action IDs can be disclosed to unauthenticated users via publicly served client
    artifacts (for example, static chunks containing action references). Affected users are applications using
    App Router and Server Actions. By itself, this disclosure is typically a recon/enumeration primitive;
    however, it can increase risk when combined with other weaknesses. This issue has been fixed in versions
    15.5.21 and 16.2.11. (CVE-2026-64643)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Next.js is a React framework for building full-stack web applications. In versions 12.0.0 through 15.5.20     and 16.0.0 through 16.2.10, Next.js applications using App Router, Server Actions (use server) or use     cache endpoints can be disclosed bypassing any authentication on the pages where these endpoints are     usually used. Server Action IDs can be disclosed to unauthenticated users via publicly served client     artifacts (for example, static chunks containing action references). Affected users are applications using     App Router and Server Actions. By itself, this disclosure is typically a recon/enumeration primitive;
    however, it can increase risk when combined with other weaknesses. This issue has been fixed in versions     15.5.21 and 16.2.11. (CVE-2026-64643)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
457151	Echo: next: security update to 15.5.21	Tenable Cloud Security	Echo Local Security Checks	Local	medium
457151	Echo: next: security update to 15.5.21	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
330674	Linux Distros Unpatched Vulnerability : CVE-2026-64643	Nessus	Misc.	Local	medium
445135	SCA: security update for next (GHSA-955p-x3mx-jcvp)	Tenable Cloud Security	SCA Checks	Local	medium
445135	SCA: security update for next (GHSA-955p-x3mx-jcvp)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium

Detections

Analytics

CVE-2026-64643

medium

Tenable Plugins

medium

medium

medium

medium

medium