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CVE-2025-49826: Next.JS vulnerability can lead to DoS via cache poisoning

July 3, 2025

A vulnerability affecting Next.js has been addressed. It impacted versions 15.0.4 through 15.1.8 and involved a cache poisoning bug leading to a Denial of Service (DoS) condition.

Under certain conditions, this issue may allow a HTTP 204 response to be cached for static pages, leading to the 204 response being served to all users attempting to access the page

More details: CVE-2025-49826

References

  • github.com/advisories/GHSA-67rr-84xm-4c7r
  • github.com/vercel/next.js
  • github.com/vercel/next.js/commit/16bfce64ef2157f2c1dfedcfdb7771bc63103fd2
  • github.com/vercel/next.js/commit/a15b974ed707d63ad4da5b74c1441f5b7b120e93
  • github.com/vercel/next.js/security/advisories/GHSA-67rr-84xm-4c7r
  • nvd.nist.gov/vuln/detail/CVE-2025-49826
  • vercel.com/changelog/cve-2025-49826

Code Behaviors & Features

Detect and mitigate CVE-2025-49826 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →

Affected versions

All versions starting from 15.0.4-canary.51 before 15.1.8

Fixed versions

  • 15.1.8

Solution

Upgrade to version 15.1.8 or above.

Impact 7.5 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Learn more about CVSS

Weakness

  • CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Source file

npm/next/CVE-2025-49826.yml

Spotted a mistake? Edit the file on GitLab.

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