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, a server-side fetch with a request body may return a cached response body from a different request to the same URL but different body. Confidential data in the POST's response body would then leak to unauthorized requests. Though the request itself will not be deduped. This only applies to fetch calls with a request that has a different init than the one passed to fetch. A safe request would be: fetch(new Request(init), init). An unsafe request would be: fetch(new Request(init), aDifferentInit). This issue has been fixed in versions 15.5.21 and 16.2.11.

The version of Next.js installed on the remote host is 12.0.0 prior to 15.5.21 or 16.0.0 prior to 16.2.11. It is, therefore, affected by multiple vulnerabilities:

- A Server-Side Request Forgery vulnerability in rewrites via an attacker-controlled destination hostname. (CVE-2026-64645)

- A Server-Side Request Forgery vulnerability in Server Actions on custom servers. This issue only affects versions 14.1.1 and later. (CVE-2026-64649)

- A Middleware / Proxy bypass in App Router applications using Turbopack and a single locale. This issue only affects versions 16.0.0 and later. (CVE-2026-64642)

- A denial of service vulnerability in App Router applications using Server Actions. This issue only affects versions 13.0.0 and later. (CVE-2026-64641)

- A denial of service vulnerability due to unbounded Server Action payloads in the Edge runtime. This issue only affects versions 13.0.0 and later. (CVE-2026-64646)

- A denial of service vulnerability in the Image Optimization API using SVGs. This issue only affects versions 15.5.0 and later. (CVE-2026-64644)

- A cache confusion of response bodies for requests with bodies. This issue only affects versions 13.0.0 and later. (CVE-2026-64648)

- A cache confusion of response bodies for requests with bodies containing invalid UTF-8 byte sequences. This issue only affects versions 13.0.0 and later. (CVE-2026-64647)

- An unauthenticated disclosure of internal Server Function endpoints. This issue only affects versions 13.0.0 and later. (CVE-2026-64643)

Note that the scanner has not attempted to exploit these issues but has instead relied only on application's self-reported version number.

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, a server-side fetch with a request body may return a cached response body from
    a different request to the same URL but different body. Confidential data in the POST's response body
    would then leak to unauthorized requests. Though the request itself will not be deduped. This only applies
    to fetch calls with a request that has a different init than the one passed to fetch. A safe request would
    be: fetch(new Request(init), init). An unsafe request would be: fetch(new Request(init), aDifferentInit).
    This issue has been fixed in versions 15.5.21 and 16.2.11. (CVE-2026-64648)

The Next.js Framework on the remote host is affected by multiple vulnerabilities:

  - A server-side fetch with a request body may return a cached response body from a different request to the     same URL but different body. Confidential data in the POST's response body would then leak to unauthorized     requests, though the request itself will not be deduped. This only applies to fetch calls with a request     that has a different init than the one passed to fetch. Applications using Pages Router are not     vulnerable. (CVE-2026-64648)

  - Requests targeting Next.js applications using App Router with at least one Server Action can lead to     excessive memory consumption if that Server Action uses the Edge runtime. (CVE-2026-64646)

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
115757	Next.js 16.0.x < 16.2.11 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	Version Based	high
115756	Next.js 12.0.0 < 15.5.21 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	Version Based	high
455307	Echo: next: security update to 15.5.21	Tenable Cloud Security	Echo Local Security Checks	Local	medium
455307	Echo: next: security update to 15.5.21	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
342581	Next.js Framework 13.x < 15.5.21 / 16.x < 16.2.11 Multiple Vulnerabilities	Nessus	Misc.	Local	medium
445180	SCA: security update for next (GHSA-68g3-v927-f742)	Tenable Cloud Security	SCA Checks	Local	medium
445180	SCA: security update for next (GHSA-68g3-v927-f742)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium

Detections

Analytics

CVE-2026-64648

medium

Tenable Plugins

high

high

medium

medium

medium

medium

medium