GHSA-q4gf-8mx6-v5v3: Next Denial of Service Vulnerability

HIGH
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CVSS 7.5
CWE-770
Published
Advisory Summary

GHSA-q4gf-8mx6-v5v3 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-770: Allocation of Resources Without Limits or Throttling) affecting Next libraries in the npm ecosystem. The issue involves next.js has a denial of service with server components. Remediation is available by upgrading affected packages to version 15.5.15, 16.2.3.

GHSA-q4gf-8mx6-v5v3 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-q4gf-8mx6-v5v3
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-770: Allocation of Resources Without Limits or Throttling
Affected Product Next
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix GHSA-q4gf-8mx6-v5v3

To remediate this vulnerability, upgrade all affected Next dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

next fixed: 15.5.15 
npm install next@15.5.15
next fixed: 16.2.3 
npm install next@16.2.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls next

How to Check if You Are Affected

To determine whether your Node.js application is affected by GHSA-q4gf-8mx6-v5v3, inspect your project dependencies using npm:

npm ls next

Analyze the terminal output to locate any version of Next in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 15.5.15), your application is affected.

Note: The npm ls next command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-770: Allocation of Resources Without Limits or Throttling, where the product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. In Next, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A vulnerability affects certain React Server Components packages for versions 19.x and frameworks that use the affected packages, including Next.js 13.x, 14.x, 15.x, and 16.x using the App Router. The issue is tracked upstream as [CVE-2026-23869](https://github.com/facebook/react/security/advisories/GHSA-479c-33wc-g2pg). You can read more about this advisory our [this changelog](https://vercel.com/changelog/summary-of-cve-2026-23869). A specially crafted HTTP request can be sent to any App Router Server Function endpoint that, when deserialized, may trigger excessive CPU usage. This can result in denial of service in unpatched environments.

GHSA-q4gf-8mx6-v5v3 Affected Next Versions

2 component(s)
Fixed Versions:
15.5.1516.2.3
Product / Package Ecosystem Affected Versions Fixed Version
next
npm/next
npm
≥ 13.0.0
< 15.5.15
15.5.15
next
npm/next
npm
≥ 16.0.0-beta.0
< 16.2.3
16.2.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/vercel/next.js/security/advisories/GHSA-q4gf-8mx6-v5v3
Next Source Repository REPOSITORY
https://github.com/vercel/next.js
vercel.com/changelog/summary-o... WEB
https://vercel.com/changelog/summary-of-cve-2026-23869

Frequently Asked Questions

What is GHSA-q4gf-8mx6-v5v3?
GHSA-q4gf-8mx6-v5v3 is a security vulnerability in Next involving Next.js has a Denial of Service with Server Components under CWE-770: Allocation of Resources Without Limits or Throttling.
Which Next versions are affected?
Affected versions include releases prior to 15.5.15, 16.2.3 across affected packages: next.
What version fixes GHSA-q4gf-8mx6-v5v3?
Upgrading to 15.5.15, 16.2.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is next affected?
Yes, next is affected in releases prior to 15.5.15, 16.2.3. Upgrade your dependency to 15.5.15, 16.2.3 or later.
What is the CVSS score of GHSA-q4gf-8mx6-v5v3?
GHSA-q4gf-8mx6-v5v3 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with GHSA-q4gf-8mx6-v5v3?
GHSA-q4gf-8mx6-v5v3 is classified under CWE-770: Allocation of Resources Without Limits or Throttling (The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.).
How can I check npm dependencies for GHSA-q4gf-8mx6-v5v3?
Run the dependency tree command: 'npm ls next'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-q4gf-8mx6-v5v3",
  "modified" : "2026-04-10T15:35:47Z",
  "published" : "2026-04-10T15:35:47Z",
  "aliases" : [ ],
  "summary" : "Next.js has a Denial of Service with Server Components",
  "details" : "A vulnerability affects certain React Server Components packages for versions 19.x and frameworks that use the affected packages, including Next.js 13.x, 14.x, 15.x, and 16.x using the App Router. The issue is tracked upstream as [CVE-2026-23869](https://github.com/facebook/react/security/advisories/GHSA-479c-33wc-g2pg). You can read more about this advisory our [this changelog](https://vercel.com/changelog/summary-of-cve-2026-23869).\n\nA specially crafted HTTP request can be sent to any App Router Server Function endpoint that, when deserialized, may trigger excessive CPU usage. This can result in denial of service in unpatched environments.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "next"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "13.0.0"
      }, {
        "fixed" : "15.5.15"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "next"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "16.0.0-beta.0"
      }, {
        "fixed" : "16.2.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/vercel/next.js/security/advisories/GHSA-q4gf-8mx6-v5v3"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/vercel/next.js"
  }, {
    "type" : "WEB",
    "url" : "https://vercel.com/changelog/summary-of-cve-2026-23869"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-770" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-10T15:35:47Z",
    "nvd_published_at" : null
  }
}