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Vulnerability · Published Sep 1, 2026 · Assigned by GitHub_M

CVE-2026-75604Next.js: Unauthenticated Remote Code Execution on windows-hosted servers

Critical 9.0

In plain English

A critical-severity path traversal in next.js from vercel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.1% (higher than 82% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.0Critical
Exploit odds (30 days)2.1%top 18.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling2Metasploit, Public PoC

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npmnext15.5.24GHSA-p293-qw3h-jr36
npmnext16.3.3GHSA-p293-qw3h-jr36

Affected products (as reported)

VendorProductVersions
vercel next.js >= 13.4.0, < 15.5.24>= 16.0.0, < 16.3.3

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

References