CVE-2026-75604
Next.js: Unauthenticated Remote Code Execution on windows-hosted servers
Impact
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
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | next | >= 13.4.0, < 15.5.24 | 15.5.24 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-p293-qw3h-jr36
- https://github.com/vercel/next.js/security/advisories/GHSA-p293-qw3h-jr36
- https://nvd.nist.gov/vuln/detail/CVE-2026-75604
- https://github.com/vercel/next.js/commit/968b9fcb26bdeb8e0a861a9df05361474666d51b
- https://github.com/vercel/next.js/commit/b0f3460a92b955d3ca41fccff9a525a2b910fbf3
- https://github.com/vercel/next.js/releases/tag/v15.5.24
- https://github.com/vercel/next.js/releases/tag/v16.3.3