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CVE-2025-49826

Next.js DoS vulnerability via cache poisoning

Published: Jul 3, 2025Updated: Sep 10, 2025 Sources: CVE List NVD GHSA BDUCWE-444
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.8%
Top 48.2%
CISA KEV
Not in KEV
Exploits
5 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-444

Affected Products

next.jsvercel
LibraryLibrary
OSS Libraries / web-framework
Next.jsVercel
LibraryLibrary
OSS Libraries / web-framework
nextnpmOSS Libraries
vercelcommercialUSOSS Librariesaka vercel
npmpackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

5 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://github.com/vercel/next.js/commit/a15b974ed707d63ad4da5b74c1441f5b7b120e93
github.com
https://github.com/vercel/next.js/releases/tag/v15.1.8
github.com
https://github.com/vercel/next.js/security/advisories/GHSA-67rr-84xm-4c7r
github.com
and 4 more references View all →

Timeline

Published
Jul 3, 2025
Last Updated
Sep 10, 2025

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