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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11A shared cache can serve an RSC payload where a visitor expects HTML if it treats different response variants as interchangeable. For a Next.js deployment, the durable fix is to upgrade to a release patched for the specific advisory; until then, make the CDN or reverse proxy partition cache entries correctly by RSC-related request headers, honor the response’s Vary behavior, or disable shared caching for affected responses.
What RSC cache poisoning means
React Server Components (RSC) applications can return different representations depending on the request. A cache-poisoning problem arises when a shared intermediary—such as a CDN or reverse proxy—stores one representation and later serves it to a request that expects another. Next.js has documented an issue in which an RSC payload could be served at a URL where a later visitor expects HTML.
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This is a response-variant and cache-handling problem. It is not the same vulnerability as an attacker executing code on the server, and it is not the same as a denial-of-service flaw. The practical questions are which framework and RSC packages your deployed build uses, whether those exact versions are affected, and whether your intermediary cache handles RSC variants correctly.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsSeparate the cache issues from RCE and denial of service
Next.js RSC response cache poisoning
Next.js advisory GHSA-wfc6-r584-vfw7 describes an RSC response-cache issue. Its reported severity is CVSS 5.4. The affected and patched releases are specific to that advisory; they do not establish that a deployment is clear of other RSC vulnerabilities.
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Distinct cache-busting collision
A separate Next.js advisory, CVE-2026-44582, concerns collisions in the _rsc cache-busting value that could lead to poisoned cache entries under affected conditions. Its reported severity is CVSS 3.7. The advisory describes a strengthened cache-busting mechanism and recommends correct handling of Vary for RSC-related request headers or disabling shared caching for affected responses while an upgrade is pending.
React2Shell and other React disclosures
React’s December 3, 2025 advisory for CVE-2025-55182 describes an unauthenticated remote-code-execution flaw in decoding requests to Server Function endpoints. React warned that an application could be vulnerable even without its own Server Function endpoint if it supports RSC. The advisory rated it CVSS 10.0 and recommended upgrading immediately. This is not cache poisoning.
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React also published later disclosures involving denial of service and source-code exposure. The January 26, 2026 update described additional DoS and source-exposure issues; a July 2026 advisory covered another DoS issue. A fix for one disclosure is not a universal fix for later, separate issues.
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How to tell whether your deployed application is vulnerable
Use the deployed build and its dependency lockfile—not just a top-level React version or a developer’s local checkout. Downstream frameworks can bundle or depend on the RSC packages differently, so the framework maintainer’s advisory for the deployed framework version is essential.
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- Identify what is actually deployed. Record the Next.js or other framework version from the production build or deployment artifact. Check the lockfile used to create that build for
react-server-dom-webpack,react-server-dom-parcel, orreact-server-dom-turbopack, as applicable. - Match each component to its own advisory. Check the current official React and framework security bulletins for the exact deployed versions. React’s initial CVE-2025-55182 advisory named RSC package versions 19.0, 19.1.0, 19.1.1, and 19.2.0 as affected, and identified Next.js, React Router, Waku, Parcel RSC, the Vite RSC plugin, and Redwood SDK among affected frameworks or bundlers.
- Check the release line and advisory date. Confirm whether the precise deployed version falls inside an advisory’s affected range and whether the recommended fix is available for that release line. Do not infer safety from an old fixed-version note or from a different framework’s package version.
- Verify the running deployment after upgrading. Confirm that the rebuilt artifact and production deployment use the patched version. Then review the CDN or reverse-proxy behavior for the RSC routes and headers described in the relevant advisory.
Next.js versions named in the May 2026 cache advisory
For GHSA-wfc6-r584-vfw7, Next.js lists these affected ranges and minimum fixed releases:
| Next.js release range | Advisory status | Minimum fixed release named |
|---|---|---|
>=14.2.0 <15.5.16 |
Affected by GHSA-wfc6-r584-vfw7 | 15.5.16 |
>=16.0.0 <16.2.5 |
Affected by GHSA-wfc6-r584-vfw7 | 16.2.5 |
These are the advisory-specific minimum fixed releases, not a standing recommendation to stop at those versions. Check the current Next.js security guidance and the latest supported patch release for the branch you deploy. The same caution applies to React package fixes: the initial RCE advisory named 19.0.1, 19.1.2, and 19.2.1 as fixed for that issue; the January 2026 update named 19.0.4, 19.1.5, and 19.2.4 for additional issues; and the July 2026 DoS advisory named 19.0.8, 19.1.9, and 19.2.8. Those figures address separate issue scopes, not a single all-purpose threshold.
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What to do if you cannot upgrade immediately
Temporary cache controls reduce exposure to the named cache behavior, but they do not replace the framework patch. Their effectiveness depends on the actual CDN or reverse-proxy configuration.
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- Honor
Vary. Confirm that the intermediary respects the response’sVaryheader for the RSC-related request headers. A header emitted by the origin is not protective if the cache ignores it. - Disable shared caching for affected responses if necessary. If you cannot verify correct variant handling, bypass shared caching for affected App Router and RSC responses until the deployment is patched.
- Test the intermediary’s behavior. Check the cache configuration and response behavior for both HTML navigation and RSC requests, including whether a response cached for one form can be returned to the other. Avoid treating a successful origin response as proof that the shared cache is configured safely.
Patch, cache controls, and WAFs address different layers
| Measure | Role | What it does not establish |
|---|---|---|
| Upgrade to the framework release patched for the advisory | Permanent corrective action for the named software issue. | That other React, framework, or cache advisories are also fixed. |
Correct cache-key partitioning and Vary handling |
Interim mitigation for shared-cache response-variant confusion. | That the application’s vulnerable code has been corrected. |
| Disable shared caching for affected RSC responses | Interim mitigation when safe variant partitioning cannot be assured. | That unrelated RSC vulnerabilities are addressed. |
| WAF rules | Additional edge defense against known exploit patterns. | That the deployed application is patched or protected from every attack variant. |
Vercel’s security bulletins describe WAF rules for known exploit patterns but caution that “WAF rules cannot guarantee protection against all possible variants of an attack.” A WAF or managed-hosting control is therefore an additional layer, not a substitute for updating the software and checking cache behavior.
Quick Recap
Deployment checklist
- Identify the framework and RSC packages in the production build and its lockfile.
- Check current React and framework advisories against those exact deployed versions.
- Upgrade to the appropriate patched release for each applicable advisory.
- Confirm that your CDN or reverse proxy partitions RSC response variants and honors relevant
Varyheaders. - Until the patch is deployed, disable shared caching for affected responses if you cannot verify correct cache behavior.
- Treat WAF rules as supplemental protection, not proof of remediation.
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