CVE-2026-75604
Next.js: Unauthenticated Remote Code Execution on windows-hosted servers
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
- vercel · next.js
- CVSS v3.1 GITHUB
- 9.0 CRITICAL
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H - EPSS
- 2.10% chance of exploitation in the next 30 days, 81st percentile
- Published
- 2026-09-01
- Updated
- 2026-09-04
Proof-of-concept exploits (5)
- rafabd1/CVE-2026-75604-poc106★ · 2026-08-28
- HackSpeak/CVE-2026-756042★ · 2026-08-26
- e4zyy/Project-CVE-2026-756043★ · 2026-08-27
- FORTBRIDGE-UK/cve-2026-756040★ · 2026-09-05
- ZeroDayEvil/CVE-2026-75604-PoC