CVE-2025-55182: Meta React Server Components (Critical, CVSS 10)
- CVSS
- 10 Critical (v3.1)
- EPSS
- 99.8% chance of exploitation in the next 30 days (higher than 99.9% of CVEs)
- Exploited in the wild
- Yes, on CISA’s KEV list since Dec 5, 2025; used by ransomware
- Public exploit
- Yes, reported in a Metasploit module, Exploit-DB, a Nuclei template and 462 GitHub repositories
- Weakness
- CWE-502
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H- Published
- Dec 3, 2025
- CISA fix-by date
- Dec 12, 2025 (for US federal agencies)
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.
Description from the National Vulnerability Database.
What to do
CISA: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Check whether you run Meta React Server Components, then apply the vendor’s fix or mitigation from the advisories below. Because this flaw is exploited or has public exploit code, treat it as urgent and check for signs of compromise, not just the patch level.
Advisories and fixes
ThreatRoundup coverage
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Sources: NVD, FIRST EPSS, CISA KEV, and public exploit databases (availability only). ThreatRoundup reports whether public exploit code exists but never links to it: fake proof-of-concepts that infect security researchers are common. This page updates automatically.