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Critical, CVSS 10.0Exploited · CISA KEVamended

React Server Components are Vulnerable to RCE

CVE-2025-55182GHSA-fv66-9v8q-g76r

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (react-server-dom-turbopack 19.2.1, 19.1.2, 19.0.1; react-server-dom-parcel 19.2.1, 19.1.2, 19.0.1; react-server-dom-webpack 19.2.1, 19.1.2, 19.0.1), redeploy, then verify what is actually installed.

Applies only when React Server Components are in use and the code runs on a server, not only in the browser.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • npm react-server-dom-turbopack

    Affected
    >= 19.1.0, < 19.1.2>= 19.2.0, <= 19.2.0>= 19.0.0, <= 19.0.0
    Fixed in
    19.1.2, 19.0.1, 19.2.1
    Only when
    React Server Components are in use; the code runs on a server, not only in the browser

  • npm react-server-dom-parcel

    Affected
    >= 19.1.0, < 19.1.2>= 19.2.0, <= 19.2.0>= 19.0.0, <= 19.0.0
    Fixed in
    19.1.2, 19.0.1, 19.2.1
    Only when
    React Server Components are in use; the code runs on a server, not only in the browser

  • npm react-server-dom-webpack

    Affected
    >= 19.1.0, < 19.1.2>= 19.2.0, <= 19.2.0>= 19.0.0, <= 19.0.0
    Fixed in
    19.1.2, 19.0.1, 19.2.1
    Only when
    React Server Components are in use; the code runs on a server, not only in the browser

Sources

  • React team, react.dev

    Vendor post: apps whose React code does not use a server, or that do not use a framework, bundler or plugin supporting React Server Components, are not affected.

    VerifiedObserved Official React team post on react.dev.

  • CISA Known Exploited Vulnerabilities Catalog

    CISA added CVE-2025-55182 to the Known Exploited Vulnerabilities catalog on 2025-12-05.

    VerifiedObserved Listed in the CISA KEV JSON feed (dateAdded 2025-12-05).

  • Open Source Vulnerabilities (OSV.dev), including the GitHub Advisory Database

    OSV record GHSA-fv66-9v8q-g76r lists affected ranges: npm react-server-dom-webpack >=19.0.0 =19.1.0 =19.2.0 =19.0.0 =19.1.0 =19.2.0 =19.0.0 =19.1.0 =19.2.0 <19.2.1

    VerifiedObserved Structured OSV record; GitHub-reviewed advisory.

  • GitHub Advisory Database and maintainer security advisories on GitHub

    GitHub-reviewed advisory GHSA-fv66-9v8q-g76r lists affected ranges: npm react-server-dom-webpack >=19.1.0 =19.2.0 =19.0.0 =19.1.0 =19.2.0 =19.0.0 =19.1.0 =19.2.0 =19.0.0 <=19.0.0

    VerifiedObserved Structured GitHub Advisory Database record (type=reviewed) from the GitHub REST API.

  • Open Source Vulnerabilities (OSV.dev), including the GitHub Advisory Database

    OSV record GHSA-fv66-9v8q-g76r lists affected ranges: npm react-server-dom-webpack >=19.0.0 =19.1.0 =19.2.0 =19.0.0 =19.1.0 =19.2.0 =19.0.0 =19.1.0 =19.2.0 <19.2.1 (fixed)

    VerifiedObserved Structured OSV record; GitHub-reviewed advisory.

Severity and exploitation
Exploitation
Confirmed: listed in the CISA Known Exploited Vulnerabilities catalog.
CVSS
10.0 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS
  • CVE-2025-55182: 99.73% estimated exploitation activity in the next 30 days; percentile 99.95 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact There is an unauthenticated remote code execution vulnerability in React Server Components. We recommend upgrading immediately. The vulnerability is present in versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0 of: react-server-dom-webpack react-server-dom-parcel react-server-dom-turbopack Patches A fix was introduced in versions 19.0.1, 19.1.2, and 19.2.1. If you are using any of the above packages please upgrade to any of the fixed versions immediately. If your app’s React code does not use a server, your app is not affected by this vulnerability. If your app does not use a framework, bundler, or bundler plugin that supports React Server Components, your app is not affected by this vulnerability. References See the blog post for more information and upgrade instructions.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 4 · amended ·

    Amended from ghsa record GHSA-fv66-9v8q-g76r

  2. Revision 3 · amended ·

    Amended from osv record GHSA-fv66-9v8q-g76r

  3. Revision 2 · amended ·

    Amended from ghsa record GHSA-fv66-9v8q-g76r

  4. Revision 1 · created ·

    Published from osv record GHSA-fv66-9v8q-g76r

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2025-55182

Advisory: React Server Components are Vulnerable to RCE
IDs: CVE-2025-55182, GHSA-fv66-9v8q-g76r
Record: https://patchnext.com/advisories/cve-2025-55182 (revision 4, source checked 26 Oct 2026, 12:41 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 10.0)
Exploitation: confirmed: listed in the CISA Known Exploited Vulnerabilities catalog.
Vendor response: Vendor fix available; fixed versions by package: react-server-dom-turbopack 19.2.1, 19.1.2, 19.0.1; react-server-dom-parcel 19.2.1, 19.1.2, 19.0.1; react-server-dom-webpack 19.2.1, 19.1.2, 19.0.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm react-server-dom-turbopack: affected >= 19.1.0, < 19.1.2; >= 19.2.0, <= 19.2.0; >= 19.0.0, <= 19.0.0; fixed in 19.1.2, 19.0.1, 19.2.1; applies only when React Server Components are in use and the code runs on a server, not only in the browser
- npm react-server-dom-parcel: affected >= 19.1.0, < 19.1.2; >= 19.2.0, <= 19.2.0; >= 19.0.0, <= 19.0.0; fixed in 19.1.2, 19.0.1, 19.2.1; applies only when React Server Components are in use and the code runs on a server, not only in the browser
- npm react-server-dom-webpack: affected >= 19.1.0, < 19.1.2; >= 19.2.0, <= 19.2.0; >= 19.0.0, <= 19.0.0; fixed in 19.1.2, 19.0.1, 19.2.1; applies only when React Server Components are in use and the code runs on a server, not only in the browser

## Suggested inspection (read-only)
- `npm ls react-server-dom-turbopack --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls react-server-dom-parcel --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls react-server-dom-webpack --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on react-server-dom-turbopack, react-server-dom-parcel, react-server-dom-webpack.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Is it true that React Server Components are in use?
- Is it true that the code runs on a server, not only in the browser?
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components (Vendor post: apps whose React code does not use a server, or that do not use a framework, bundler or plugin supporting React Server Components, are not affected.)
- Verified: https://www.cisa.gov/known-exploited-vulnerabilities-catalog (CISA added CVE-2025-55182 to the Known Exploited Vulnerabilities catalog on 2025-12-05.)
- Verified: https://osv.dev/vulnerability/GHSA-fv66-9v8q-g76r (OSV record GHSA-fv66-9v8q-g76r lists affected ranges: npm react-server-dom-webpack >=19.0.0 =19.1.0 =19.2.0 =19.0.0 =19.1.0 =19.2.0 =19.0.0 =19.1.0 =19.2.0 <19.2.1)
- Verified: https://github.com/advisories/GHSA-fv66-9v8q-g76r (GitHub-reviewed advisory GHSA-fv66-9v8q-g76r lists affected ranges: npm react-server-dom-webpack >=19.1.0 =19.2.0 =19.0.0 =19.1.0 =19.2.0 =19.0.0 =19.1.0 =19.2.0 =19.0.0 <=19.0.0)
- Verified: https://osv.dev/vulnerability/GHSA-fv66-9v8q-g76r (OSV record GHSA-fv66-9v8q-g76r lists affected ranges: npm react-server-dom-webpack >=19.0.0 =19.1.0 =19.2.0 =19.0.0 =19.1.0 =19.2.0 =19.0.0 =19.1.0 =19.2.0 <19.2.1 (fixed))

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