---
title: "CVE-2025-55182: Meta React Server Components Remote Code Execution Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-55182/
description: "CVE-2025-55182 (Meta React Server Components): Exploited in the wild (CISA KEV). A pre-authentication remote code execution vulnerability exists in React…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-12-03
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-55182"
kev: true
cvss: 10
epss: 0.99802
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-55182: Meta React Server Components Remote Code Execution Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Meta React Server Components. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-12-05, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-12-12 ; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns .
- EPSS 99.8% , percentile 100.0: FIRST’s model estimates a 99.8% chance of exploitation activity in the next 30 days, higher than 100.0% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes react-server-dom-webpack (npm) >= 19.1.0, < 19.1.2, fixed in 19.1.2 ; react-server-dom-webpack (npm) = 19.2.0, fixed in 19.2.1 ; react-server-dom-turbopack (npm) >= 19.1.0, < 19.1.2, fixed in 19.1.2 ; react-server-dom-turbopack (npm) = 19.2.0, fixed in 19.2.1 . Check your lockfile, including transitive dependencies.
- Editorial verdict: Act now. React2Shell: Unauthenticated RCE in React Server Components — If any server you run renders React Server Components and was not patched in December 2025, treat it as compromised until shown otherwise: patch, redeploy, and rotate its secrets.

## What it is

A pre-authentication remote code execution vulnerability exists in React Server Components versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0 including the following packages: react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack. The vulnerable code unsafely deserializes payloads from HTTP requests to Server Function endpoints.

## Affected packages

- npm `react-server-dom-webpack` >= 19.1.0, < 19.1.2 → fixed: 19.1.2
- npm `react-server-dom-webpack` = 19.2.0 → fixed: 19.2.1
- npm `react-server-dom-turbopack` >= 19.1.0, < 19.1.2 → fixed: 19.1.2
- npm `react-server-dom-turbopack` = 19.2.0 → fixed: 19.2.1
- npm `react-server-dom-parcel` >= 19.1.0, < 19.1.2 → fixed: 19.1.2
- npm `react-server-dom-parcel` = 19.2.0 → fixed: 19.2.1
- npm `react-server-dom-turbopack` = 19.0.0 → fixed: 19.0.1
- npm `react-server-dom-parcel` = 19.0.0 → fixed: 19.0.1
- npm `react-server-dom-webpack` = 19.0.0 → fixed: 19.0.1

## Affected products (CVE record)

- Meta react-server-dom-webpack: 19.0.0 <= 19.0.0, 19.1.0 <= 19.1.1, 19.2.0 <= 19.2.0
- Meta react-server-dom-turbopack: 19.0.0 <= 19.0.0, 19.1.0 <= 19.1.1, 19.2.0 <= 19.2.0
- Meta react-server-dom-parcel: 19.0.0 <= 19.0.0, 19.1.0 <= 19.1.1, 19.2.0 <= 19.2.0

## Severity

- Meta CVSS 3.1: 10 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`
- GitHub CVSS 3.1: 10.0 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2025-12-05; federal due date 2025-12-12. Known ransomware use: Known.
- CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 99.80% probability of exploitation activity in the next 30 days; percentile 100.0.

## Sources

- [Listed in CISA KEV notes (react.dev)](https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components)
- [Listed in CISA KEV notes (github.com)](https://github.com/vercel-labs/fix-react2shell-next?tab=readme-ov-file)
- [GitHub Advisory GHSA-fv66-9v8q-g76r](https://github.com/advisories/GHSA-fv66-9v8q-g76r)
- [CVE.org record CVE-2025-55182](https://www.cve.org/CVERecord?id=CVE-2025-55182)
- [NVD entry CVE-2025-55182](https://nvd.nist.gov/vuln/detail/CVE-2025-55182)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55182)
- [facebook.com](https://www.facebook.com/security/advisories/cve-2025-55182)
- [aws.amazon.com](https://aws.amazon.com/blogs/security/china-nexus-cyber-threat-groups-rapidly-exploit-react2shell-vulnerability-cve-2025-55182/)
- [openwall.com](http://www.openwall.com/lists/oss-security/2025/12/03/4)
- [news.ycombinator.com](https://news.ycombinator.com/item?id=46136026)
- [github.com](https://github.com/facebook/react/security/advisories/GHSA-fv66-9v8q-g76r)
- [github.com](https://github.com/facebook/react/pull/35277)
- [github.com](https://github.com/facebook/react/commit/7dc903cd29dac55efb4424853fd0442fef3a8700)
- [github.com](https://github.com/facebook/react/releases/tag/v19.0.1)
- [github.com](https://github.com/facebook/react/releases/tag/v19.1.2)
- [github.com](https://github.com/facebook/react/releases/tag/v19.2.1)
- [github.com](https://github.com/ejpir/CVE-2025-55182-poc)

---
Source page: https://erroneo.us/security/cve/CVE-2025-55182/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt