Next.js is a React framework for building full-stack web applications. Starting in version 16.0.1 and prior to version 16.1.7, a request containing the `next-resume: 1` header (corresponding with a PPR resume request) would buffer request bodies without consistently enforcing `maxPostponedStateSize` in certain setups. The previous mitigation protected minimal-mode deployments, but equivalent non-minimal deployments remained vulnerable to the same unbounded postponed resume-body buffering behavior. In applications using the App Router with Partial Prerendering capability enabled (via `experimental.ppr` or `cacheComponents`), an attacker could send oversized `next-resume` POST payloads that were buffered without consistent size enforcement in non-minimal deployments, causing excessive memory usage and potential denial of service. This is fixed in version 16.1.7 by enforcing size limits across all postponed-body buffering paths and erroring when limits are exceeded. If upgrading is not immediately possible, block requests containing the `next-resume` header, as this is never valid to be sent from an untrusted client.

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

  - A vulnerability exists in the Next.js development server where a null origin can bypass cross-site     protections on the HMR (Hot Module Replacement) websocket endpoint. An attacker with access to     attacker-controlled content reachable from the dev server could potentially connect to the HMR websocket     channel and intercept dev traffic, even when allowedDevOrigins configuration is in place. This     vulnerability only affects development mode. (CVE-2026-27977)

  - A vulnerability exists in Next.js where requests with a null origin can bypass CSRF validation in Server     Actions. Requests from opaque contexts such as sandboxed iframes could bypass origin verification instead     of being validated as cross-origin requests. An attacker could manipulate a victim's browser into executing     state-changing Server Actions from a sandboxed context using victim credentials. (CVE-2026-27978)

  - A denial of service vulnerability exists in Next.js applications with Partial Prerendering enabled. The     system fails to consistently enforce maxPostponedStateSize limits when processing next-resume header     requests in non-minimal deployments, allowing an attacker to send oversized POST payloads with the     next-resume header to trigger unbounded memory buffering and cause excessive memory consumption     potentially leading to service disruption. (CVE-2026-27979)

Note that Nessus has not tested for these issues but has instead relied only on the 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. Starting in version 16.0.1 and
    prior to version 16.1.7, a request containing the `next-resume: 1` header (corresponding with a PPR resume
    request) would buffer request bodies without consistently enforcing `maxPostponedStateSize` in certain
    setups. The previous mitigation protected minimal-mode deployments, but equivalent non-minimal deployments
    remained vulnerable to the same unbounded postponed resume-body buffering behavior. In applications using
    the App Router with Partial Prerendering capability enabled (via `experimental.ppr` or `cacheComponents`),
    an attacker could send oversized `next-resume` POST payloads that were buffered without consistent size
    enforcement in non-minimal deployments, causing excessive memory usage and potential denial of service.
    This is fixed in version 16.1.7 by enforcing size limits across all postponed-body buffering paths and
    erroring when limits are exceeded. If upgrading is not immediately possible, block requests containing the
    `next-resume` header, as this is never valid to be sent from an untrusted client. (CVE-2026-27979)

ID	Name	Product	Family	Severity
303199	Next.js Framework 16.0.1 < 16.1.7 Multiple Vulnerabilities	Nessus	Misc.	medium
438898	SCA: security update for next (GHSA-h27x-g6w4-24gq)	Tenable Cloud Security	SCA Checks	medium
438898	SCA: security update for next (GHSA-h27x-g6w4-24gq)	Tenable Self-Hosted Container Security	SCA Checks	medium

Detections

Analytics

CVE-2026-27979

medium

Tenable Plugins

medium

medium

medium