Mend.io Vulnerability Database
The largest open source vulnerability database
What is a Vulnerability ID?
New vulnerability? Tell us about it!
CVE-2026-64648
Published:July 27, 2026
Updated:August 04, 2026
Next.js is a React framework for building full-stack web applications. In versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10, a server-side fetch with a request body may return a cached response body from a different request to the same URL but different body. Confidential data in the POST's response body would then leak to unauthorized requests. Though the request itself will not be deduped. This only applies to fetch calls with a request that has a different init than the one passed to fetch. A safe request would be: fetch(new Request(init), init). An unsafe request would be: fetch(new Request(init), aDifferentInit). This issue has been fixed in versions 15.5.21 and 16.2.11.
Affected Packages
https://github.com/vercel/next.js.git (GITHUB):
Affected version(s) >=v13.0.0 <v15.5.21
Fix Suggestion:
Update to version v15.5.21
https://github.com/vercel/next.js.git (GITHUB):
Affected version(s) >=v16.0.0 <v16.2.11
Fix Suggestion:
Update to version v16.2.11
next (NPM):
Affected version(s) >=13.0.0 <15.5.21
Fix Suggestion:
Update to version 15.5.21
next (NPM):
Affected version(s) >=16.0.0 <16.2.11
Fix Suggestion:
Update to version 16.2.11
Do you need more information?
Contact Us
CVSS v4
Base Score:
6
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Use of Cache Containing Sensitive Information
EPSS
Base Score:
0.34