Vulnerability in Facebook React
CVE-2025-55183
An information leak vulnerability exists in specific configurations of React Server Components versions 19.0.0, 19.0.1 19.1.0, 19.1.1, 19.1.2, 19.2.0 and 19.2.1, including the following packages: react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack. A specifically crafted HTTP request sent to a vulnerable Server Function may unsafely return the source code of any Server Function. Exploitation requires the existence of a Server Function which explicitly or implicitly exposes a stringified argument.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.642 (99.2th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.642 · newest: 0.642 · change: 0.000
Affected products
- Facebook React
- Meta React-Server-Dom-Parcel — versions 19.0.0, 19.1.0, 19.2.0
- Meta React-Server-Dom-Turbopack — versions 19.0.0, 19.1.0, 19.2.0
- Meta React-Server-Dom-Webpack — versions 19.0.0, 19.1.0, 19.2.0
- Vercel Next.js — versions 15.6.0, 16.1.0
Public proof-of-concept exploits
References
- www.facebook.com/security/advisories/cve-2025-55183 (Vendor Advisory)
- react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-s… (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-55183?
- CVE-2025-55183 is a medium-severity vulnerability in Facebook React. CVSS score: 5.3/10. Published 2025-12-11.
- How severe is CVE-2025-55183?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2025-55183 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.