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

In short

Meta React Server Components has a weakness classified as deserialization of untrusted data (CWE-502). CISA added it to its Known Exploited Vulnerabilities catalog on 2025-12-05. NVD lists CVSS 3.1 at 10 CRITICAL. CISA reports known ransomware campaign use.

What it is

“Meta React Server Components contains a remote code execution vulnerability that could allow unauthenticated remote code execution by exploiting a flaw in how React decodes payloads sent to React Server Function endpoints. Please note CVE-2025-66478 has been rejected, but it is associated with CVE-2025- 55182.” — CISA KEV, retrieved 2026-11-01
“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.” — NVD, retrieved 2026-11-01

Who is affected

Meta React Server Components. NVD lists the following versions as affected:

  • Facebook React: version 19.0.0
  • Facebook React: version 19.1.0
  • Facebook React: version 19.1.1
  • Facebook React: version 19.2.0
  • Vercel next.js: from 15.0.0 inclusive, before 15.0.5
  • Vercel next.js: from 15.1.0 inclusive, before 15.1.9
  • Vercel next.js: from 15.2.0 inclusive, before 15.2.6
  • Vercel next.js: from 15.3.0 inclusive, before 15.3.6
  • Vercel next.js: from 15.4.0 inclusive, before 15.4.8
  • Vercel next.js: from 15.5.0 inclusive, before 15.5.7
  • Vercel next.js: from 16.0.0 inclusive, before 16.0.7
  • Vercel next.js: version 14.3.0
  • Vercel next.js: version 15.6.0
  • Vercel next.js: version 16.0.0

Exploitation status

CISA KEV added: 2025-12-05. Known ransomware campaign use: Known (reported by CISA). Due date CISA set for US federal civilian agencies: 2025-12-12.

Scores

NVD CVSS 3.1: 10 CRITICAL; vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H; source [email protected].

EPSS by FIRST: 99.80%; percentile 99.96; score date 2026-10-31. EPSS estimates the probability of exploitation in the next 30 days.

CWE: CWE-502.

Timeline

Source events
DateEvent
2025-12-03T16:15:56.463NVD published
2025-12-05CISA KEV added
2025-12-12CISA KEV due
2026-10-18T17:10:00.110NVD last modified
2026-10-31FIRST EPSS score

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 KEV

What to do

  • Confirm whether you run Meta React Server Components and which version.
  • Apply the vendor update or mitigation in the advisory.
  • Follow CISA’s required action.
  • Review the vendor guidance on signs of compromise.
  • Track the fix through completion.

References

Sources and dates

CISA Known Exploited Vulnerabilities Catalog, version 2026.10.30; retrieved 2026-11-01. CISA KEV data: CC0 1.0. No endorsement by CISA.

NVD retrieved: 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

EPSS scores by FIRST; score date 2026-10-31.

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