CVE-2025-49826CWE-444

Next.js DoS vulnerability via cache poisoning

High · published July 3, 2025

CVSS v3.1
7.5
EPSS
1%
Percentile
66.2
In the wild
Unconfirmed
What it is

Next.js is a React framework for building full-stack web applications. From versions 15.0.4-canary.51 to before 15.1.8, a cache poisoning bug leading to a Denial of Service (DoS) condition was found in Next.js. This issue does not impact customers hosted on Vercel. 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. This issue has been addressed in version 15.1.8.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.01133 · 66.2th percentile
Weakness
CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Published
2025-07-03T21:03Z
EPSS history
Timeline
  • 03 JUL 21:03Z
    Next.js DoS vulnerability via cache poisoning
    cvelistv5