CVE-2025-49826

Name: CVE-2025-49826
Creator: NVD / NIST
Published: 2025-07-03T21:15:27.287+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.80%

Last modified Jun 17, 2026

CVE-2025-49826 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.80% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.80%

51.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-444

Affected Software

Vendor	Product	Versions	Update
Vercel	Next.Js	> 15.0.4, < 15.1.8	—
Vercel	Next.Js	15.0.4	Canary51

References

https://github.com/vercel/next.js/commit/a15b974ed707d63ad4da5b74c1441f5b7b120e93Patch
https://github.com/vercel/next.js/releases/tag/v15.1.8Release Notes
https://github.com/vercel/next.js/security/advisories/GHSA-67rr-84xm-4c7rVendor Advisory
https://vercel.com/changelog/cve-2025-49826Vendor Advisory

Timeline

Published: Jul 3, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-49826?

How severe is CVE-2025-49826?

CVE-2025-49826 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.80% probability of exploitation in the next 30 days.

How do I fix CVE-2025-49826?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-49826?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST