Next.js: Unauthenticated Remote Code Execution on windows-hosted servers (CVE-2026-75604) | HOL Guard CVE

Critical severityCVE-2026-75604GHSA-P293-QW3H-JR36

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

Answer in brief

CVE-2026-75604 records a Critical severity vulnerability in Next.js: Unauthenticated Remote Code Execution on windows-hosted servers. The current sources do not mark it as known exploited. The current feed maps vercel/next.js (generic), next (npm), next (npm). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 1, 2026Updated Sep 1, 2026Source checked Sep 1, 2026First seen by HOL Aug 25, 2026Material review Sep 1, 2026

Upstream Advisory

Key facts

Risk: Critical
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps vercel/next.js (generic), next (npm), next (npm). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
vercel/next.jsgeneric	>= 13.4.0, < 15.5.24 \|\| >= 16.0.0, < 16.3.3	Not reported
nextnpm	>=13.4<15.5.24	Not reported
nextnpm	>=16.0<16.3.3	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for vercel/next.js, next, next.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 25, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.