Next.js Windows RCE CVE-2026-75604: Affected Versions and Patch Checklist
GitHub's reviewed Next.js advisory for CVE-2026-75604 describes a critical unauthenticated remote-code-execution risk for affected Next.js applications hosted on a Windows filesystem. The advisory lists affected Next.js ranges as >=13.4.0 and <15.5.24, plus >=16.0.0 and <16.3.3, with patched releases 15.5.24 and 16.3.3. It says the impact applies to applications using Pages and App Router without Cache Components on Windows-hosted servers and that there is no known workaround for affected Windows deployments. If your production environment matches the affected conditions, upgrade to a patched release immediately, verify the actual deployed artifact, run the full test/build pipeline and preserve a rollback point.
Your Next.js production server runs on a Windows filesystem
The application uses the affected router/cache configuration described in GHSA-p293-qw3h-jr36
A dependency or security scanner flags CVE-2026-75604 or GHSA-p293-qw3h-jr36
You updated package.json but have not confirmed which Next.js version is actually running in production
Possible causes
The reviewed advisory identifies a path-handling weakness that can become remote code execution under the affected Windows-hosted configuration
Windows filesystem behavior is part of the impact condition, so a generic Next.js version check alone is not the full exposure assessment
Applications can remain vulnerable when an old container, service, build artifact or server is still running after source dependencies are updated
The advisory states that affected Windows-hosted applications do not have a known workaround, making the patched framework release the primary remediation
HOW TO FIX IT
Work from the safest step to the harder repair.
Step 1. Inventory the exact Next.js version running in every production environment. The reviewed advisory lists affected ranges as >=13.4.0 and <15.5.24, plus >=16.0.0 and <16.3.3. It lists 15.5.24 and 16.3.3 as patched releases.
Step 2. Confirm the operating environment instead of assuming exposure from the version number alone. The advisory describes the RCE impact for servers hosted on machines using a Windows filesystem and for the affected router/cache configuration.
Step 3. If the deployment matches the affected Windows-hosted conditions, upgrade immediately to an appropriate patched Next.js release. The advisory says there is no known workaround for affected Windows-hosted applications, so do not substitute a speculative configuration tweak for the vendor patch.
Step 4. Preserve a reversible deployment point before upgrading. Update the lockfile through the project's normal package-management flow and review the resulting dependency diff rather than suppressing the advisory.
Step 5. Run the full TypeScript typecheck, automated tests and production build. Exercise both Pages Router and App Router routes used by the application, including dynamic or cached routes, forms or Server Actions, authentication, uploads and any request paths that write or read server-side data.
Step 6. Verify the deployed artifact after release. Confirm the actual running Next.js version on each Windows server, container or service and ensure older instances are not still receiving traffic.
Step 7. Review production logs and security monitoring for abnormal file/path, cache or server-action behavior without publishing sensitive payloads, credentials, private paths or exploit details. If compromise is suspected, use the organization's incident-response process rather than treating an upgrade alone as proof the environment is clean.
Step 8. Keep this advisory separate from other 2026 Next.js security issues such as the AVIF image-optimization vulnerability. Two advisories can share patched version numbers while having different impact conditions and remediation context.
Need the actual code? Go to GenesisCodeDoctor.com to search the Code Store or request code for the exact platform, error, and repair you are working on.
Patch through a reviewed, reversible deployment path and retain the pre-upgrade build or checkpoint long enough to recover from unrelated regressions.
Use only systems you own or are authorized to test when validating security behavior; routine remediation does not require exploit reproduction.
Keep internal filesystem paths, server-action details, secrets, environment variables and incident artifacts out of public troubleshooting output.
STOP AND GET HELP WHEN
Do not turn a repair into a larger outage.
Do not run or publish proof-of-concept exploit code against production or third-party systems.
Do not say every Next.js site is vulnerable; the advisory's impact depends on the affected version and Windows-hosted/router-cache conditions.
Do not rely on a package.json edit, a local node_modules version or a CI log as proof that every production server is patched.
Do not weaken authentication, cache protections, filesystem permissions or other controls as a workaround; the reviewed advisory says there is no known workaround for affected Windows-hosted deployments.
HOW GENESIS HANDLES IT
Diagnose the exact failure before choosing a repair.
Genesis separates the visible symptom from the underlying technical cause. Run the supported diagnostic first, review the evidence, and then use a matching repair only when the failure is actually verified.
Platform scope
Next.js 13.4+ applications hosted on Windows filesystems, especially deployments using the affected Pages/App Router configuration
Category
Next.js · Security · Current advisories
Last updated
2026-09-22
REPAIR PROFILE
Know the complexity before you edit.
Difficulty
Intermediate
Change risk
High
These labels describe implementation complexity and blast radius, not a guaranteed repair time.
AUTHORITATIVE SOURCES
Verify time-sensitive platform details at the source.
Which Next.js versions are affected by CVE-2026-75604?
The reviewed advisory lists >=13.4.0 and <15.5.24, plus >=16.0.0 and <16.3.3, as affected ranges.
Which Next.js versions patch CVE-2026-75604?
The advisory lists 15.5.24 and 16.3.3 as patched releases.
Does CVE-2026-75604 affect every Next.js deployment?
No. The reviewed advisory describes the RCE impact for affected applications hosted on Windows filesystems and using the specified Pages/App Router configuration without Cache Components.
Is there a workaround instead of upgrading?
The reviewed advisory says there is no known workaround for affected Windows-hosted applications and recommends upgrading immediately.
Once you know the platform and the verified problem, search the Genesis Code Doctor Code Store for a matching package. If the exact integration or repair is not there, use Request a Code and describe the platform, official documentation, desired behavior, and sanitized error—never send your secret key.
Start with a free diagnostic. If Genesis verifies a problem and a compatible treatment exists, continue to the matching Code Store product or repair path. If you cannot find the exact code you need, request it at GenesisCodeDoctor.com rather than forcing a generic snippet into the wrong platform.
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