Vulnerability DatabaseCVE-2026-119346
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CVE-2026-119346
Published:November 03, 2026
Updated:November 04, 2026
<!-- https://linear.app/vercel/issue/NSEC-717 --> Next.js applications that set cookies through `NextResponse` on Edge runtime routes — App Router route handlers and Pages Router Edge API routes — send an internal `x-middleware-set-cookie` header in the public response, duplicating the cookie value and its attributes. This makes HttpOnly cookies, such as session tokens, readable by JavaScript running on the same origin when an application sets a sensitive cookie on an affected response.
Affected Packages
https://github.com/vercel/next.js.git (GITHUB):
Affected version(s) >=v14.2.8 <v15.5.29 || >=v14.3.0-canary.24 <v15.5.29 || >=v15.0.0-rc.0 <v15.5.29 || >=v15.0.0 <v15.5.29
Fix Suggestion:
Update to version v15.5.29
https://github.com/vercel/next.js.git (GITHUB):
Affected version(s) >=v15.6.0-canary.0 <v16.4.5 || =v16.0.0-beta.0 <v16.4.5 || >=v16.0.0 <v16.4.5
Fix Suggestion:
Update to version v16.4.5
https://github.com/vercel/next.js.git (GITHUB):
Affected version(s) >=v16.5.0-canary.0 <v16.5.0-canary.39
Fix Suggestion:
Update to version v16.5.0-canary.39
next (NPM):
Affected version(s) >=15.0.0 <15.5.29 || >=14.2.8 <15.5.29 || >=15.0.0-rc.0 <15.5.29 || >=14.3.0-canary.24 <15.5.29
Fix Suggestion:
Update to version 15.5.29
next (NPM):
Affected version(s) >=16.5.0-canary.0 <16.5.0-canary.39
Fix Suggestion:
Update to version 16.5.0-canary.39
next (NPM):
Affected version(s) >=15.6.0-canary.0 <16.4.5 || >=16.0.0 <16.4.5 || =16.0.0-beta.0 <16.4.5
Fix Suggestion:
Update to version 16.4.5
Related Resources (3)
https://github.com/vercel/next.js
https://github.com/vercel/next.js/security/advisories/GHSA-f3mh-rxg3-f5g2
https://nvd.nist.gov/vuln/detail/CVE-2026-119346
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CVSS v4
Base Score:
6
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Exposure of Sensitive Information to an Unauthorized Actor
CWE-200