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CVE-2026-75604

Next.js: Unauthenticated Remote Code Execution on windows-hosted servers

Published: Sep 1, 2026Updated: Sep 4, 2026 Sources: CVE List NVDCWE-22
9.0CRITICAL
NVD MITRE
EPSS Score
1.1%
Top 37.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
OpenVAS

Description

Next.js is a React framework for building full-stack web applications. From 13.4.0 until 15.5.24 and 16.3.3, Next.js applications using Pages Router or App Router without Cache Components on Windows-hosted servers do not consistently escape backslashes in route segments before constructing incremental-cache paths. In packages/next/src/shared/lib/router/utils/escape-path-delimiters.ts and packages/next/src/server/lib/incremental-cache/file-system-cache.ts, a remote request can supply encoded Windows path separators that traverse outside the intended cache root and expose private build data, including the server-reference-manifest encryption key. Disclosure of that key can enable remote code execution in the affected application. This issue is fixed in versions 15.5.24 and 16.3.3.

In plain language

AI Act now

CVE-2026-75604 is a serious Next.js bug where an attacker (no login needed) can use special web requests against Windows-hosted servers to steal a hidden key and then run code on the server; you should act quickly if you run affected Next.js on Windows with Pages/App Router and without Cache Components.

Executive summary

Unauthenticated remote code execution on Windows-hosted Next.js via crafted requests that exploit improper escaping of Windows file path separators, allowing path traversal to expose a server-reference-manifest encryption key (then enabling arbitrary code execution) in Next.js versions 13.4.0–15.5.24 and 16.3.3 when using Pages/App Router without Cache Components.

If affected, business impact
Full server takeoverMalicious code executionTheft of protected build keysOperational disruption

What to do now

  1. Check your Next.js version and confirm you run on Windows, using Pages or App Router, and that Cache Components are not enabled.
  2. If you match those conditions, upgrade Next.js to 15.5.24 or 16.3.3 (whichever fits your upgrade path).
  3. After upgrading, restart the application and verify the new version is active across all servers.
npm install next@15.5.24
May need vendor / contractor work

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-22

Affected Products

vercel
commercial·US
next.jsLibraryLibrary
OSS Libraries / web-framework

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Collection
Discovery
View detailed technique mapping

References

https://github.com/vercel/next.js/security/advisories/GHSA-p293-qw3h-jr36
github.com
https://github.com/vercel/next.js/commit/968b9fcb26bdeb8e0a861a9df05361474666d51b
github.com
https://github.com/vercel/next.js/commit/b0f3460a92b955d3ca41fccff9a525a2b910fbf3
github.com
and 2 more references View all →
News mentions
3

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