CVE-2026-75604

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

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Severity

Critical

Red Hat Product Security

8.1

CVSS 3.1

Review impact separately from score.

Published · September 2, 2026

Updated · October 5, 2026

Description

A flaw was found in Next.js. When running on Windows systems, the application fails to properly sanitize backslashes in request paths before building file cache locations. An unauthenticated remote attacker can exploit this directory traversal weakness by submitting crafted requests to access sensitive build files and encryption keys, which can lead to arbitrary code execution.

Statement

Only Windows hosts are vulnerable to this issue; Red Hat supported products are not affected.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 8.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')