CVE-2025-32421: Next Next.js Race Condition To Cache Vulnerability

LOW
Advisory Identifier: GHSA-qpjv-v59x-3qc4
Share
CVSS 3.7
CWE-362
Published
Advisory Summary

CVE-2025-32421 is a LOW (CVSS 3.7) next.js race condition to cache vulnerability (CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')) affecting Next libraries in the npm ecosystem. The issue involves next.js race condition to cache poisoning. Remediation is available by upgrading affected packages to version 14.2.24, 15.1.6.

CVE-2025-32421 at a Glance

CVE Identifier CVE-2025-32421
GHSA Identifier GHSA-qpjv-v59x-3qc4
Severity LOW
CVSS v3.1 Base Score 3.7
CWE Classification CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Affected Product Next
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 3.7

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

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

How to Fix CVE-2025-32421

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: 14.2.24 
npm install next@14.2.24
next fixed: 15.1.6 
npm install next@15.1.6
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 CVE-2025-32421, 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 14.2.24), 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-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'), where the product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently. 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

**Summary** We received a responsible disclosure from Allam Rachid (zhero) for a low-severity race-condition vulnerability in Next.js. This issue only affects the **Pages Router** under certain misconfigurations, causing normal endpoints to serve `pageProps` data instead of standard HTML. [Learn more here](https://vercel.com/changelog/cve-2025-32421) **Credit** Thank you to **Allam Rachid (zhero)** for the responsible disclosure. This research was rewarded as part of our bug bounty program.

CVE-2025-32421 Affected Next Versions

2 component(s)
Fixed Versions:
14.2.2415.1.6
Product / Package Ecosystem Affected Versions Fixed Version
next
npm/next
npm
≥ 0.9.9
< 14.2.24
14.2.24
next
npm/next
npm
≥ 15.0.0
< 15.1.6
15.1.6

References

GitHub Advisory / Wiki ADVISORY
https://github.com/vercel/next.js/security/advisories/GHSA-qpjv-v59x-3qc4
NVD — CVE-2025-32421 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-32421
Next Source Repository REPOSITORY
https://github.com/vercel/next.js
vercel.com/changelog/cve-2025-... WEB
https://vercel.com/changelog/cve-2025-32421

Frequently Asked Questions

What is CVE-2025-32421?
CVE-2025-32421 is a security vulnerability in Next involving Next.js Race Condition to Cache Poisoning under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition').
Which Next versions are affected?
Affected versions include releases prior to 14.2.24, 15.1.6 across affected packages: next.
What version fixes CVE-2025-32421?
Upgrading to 14.2.24, 15.1.6 (or the latest patched release for your respective branch) resolves the vulnerability.
Is next affected?
Yes, next is affected in releases prior to 14.2.24, 15.1.6. Upgrade your dependency to 14.2.24, 15.1.6 or later.
What is the CVSS score of CVE-2025-32421?
CVE-2025-32421 has a CVSS v3.1 base score of 3.7 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2025-32421?
CVE-2025-32421 is classified under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') (The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.).
How can I check npm dependencies for CVE-2025-32421?
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-qpjv-v59x-3qc4",
  "modified" : "2025-09-26T17:48:29Z",
  "published" : "2025-05-15T14:12:26Z",
  "aliases" : [ "CVE-2025-32421" ],
  "summary" : "Next.js Race Condition to Cache Poisoning",
  "details" : "**Summary**  \nWe received a responsible disclosure from Allam Rachid (zhero) for a low-severity race-condition vulnerability in Next.js. This issue only affects the **Pages Router** under certain misconfigurations, causing normal endpoints to serve `pageProps` data instead of standard HTML.\n\n[Learn more here](https://vercel.com/changelog/cve-2025-32421)\n\n**Credit**  \nThank you to **Allam Rachid (zhero)** for the responsible disclosure. This research was rewarded as part of our bug bounty program.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "next"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.9.9"
      }, {
        "fixed" : "14.2.24"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "next"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "15.0.0"
      }, {
        "fixed" : "15.1.6"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/vercel/next.js/security/advisories/GHSA-qpjv-v59x-3qc4"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-32421"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/vercel/next.js"
  }, {
    "type" : "WEB",
    "url" : "https://vercel.com/changelog/cve-2025-32421"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-362" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-05-15T14:12:26Z",
    "nvd_published_at" : "2025-05-14T23:15:47Z"
  }
}