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CRITICAL severity

React Server Components are Vulnerable to RCEGHSA-fmh4-wr37-44fp

CRITICAL

GHSA-fmh4-wr37-44fp is a critical-severity (CVSS 10) remote code execution vulnerability in @vitejs/plugin-rsc. A fix is available for @vitejs/plugin-rsc — see the affected versions and patch details below.

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Dec 11, 2025 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

37other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
@vitejs/plugin-rscnpm
2.5Mdownloads / week

Description

Summary

@vitejs/plugin-rsc vendors react-server-dom-webpack, which contained an unauthenticated remote code execution vulnerability in versions prior to 19.0.1, 19.1.2, and 19.2.1. See details in React repository's advisory https://github.com/facebook/react/security/advisories/GHSA-fv66-9v8q-g76r

Impact

Applications using affected versions of @vitejs/plugin-rsc are vulnerable to unauthenticated remote code execution through deserialization of untrusted data. An attacker can execute arbitrary code remotely without authentication, affecting confidentiality, integrity, and availability.

Recommendations

Upgrade immediately to @vitejs/[email protected] or later.

Workarounds

Applications not using server-side React or React Server Components are unaffected.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npm@vitejs/plugin-rscall versions0.5.3npm install @vitejs/plugin-rsc@0.5.3

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @vitejs/plugin-rsc, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update @vitejs/plugin-rsc to 0.5.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-fmh4-wr37-44fp is resolved across your whole dependency graph.

  3. Workarounds

    Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.

Frequently Asked Questions

### Summary `@vitejs/plugin-rsc` vendors `react-server-dom-webpack`, which contained an unauthenticated remote code execution vulnerability in versions prior to 19.0.1, 19.1.2, and 19.2.1. See details in React repository's advisory https://github.com/facebook/react/security/advisories/GHSA-fv66-9v8q-g76r ### Impact Applications using affected versions of `@vitejs/plugin-rsc` are vulnerable to unauthenticated remote code execution through deserialization of untrusted data. An attacker can execute arbitrary code remotely without authentication, affecting confidentiality, integrity, and availa
O3 Security · Impact-Aware SCA

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React Server Components are Vulnerable to RCE