What is 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.
The record classifies CVE-2025-55183 under weakness class NVD-CWE-noinfo. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction. 83 affected-product entries are recorded, across 2 vendors, listed below. The identifier was first published 322 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 5.3 — MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - EPSS (FIRST)
- 64.2% probability of exploitation in the next 30 days, higher than 99.2% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 8.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2025-12-11, last modified 2026-01-07
Is CVE-2025-55183 being exploited?
Weaponised exploit code for CVE-2025-55183 is publicly available. 6 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 38 in the Threadlinqs vulnerability feed.
- williavs/nextjs-security-update (github)
- kimtruth/CVE-2025-55183-poc (github)
- StealthMoud/react-server-cve-lab (github)
- X-Cotang/CVE-2025-55183_POC (github)
- Saturate/CVE-2025-55183 (github)
- omaidnebari/RSC-Scanner-POC (github)
Affected products and versions
Showing 4 of 83 recorded product entries.
Affected software packages:
npm:react-server-dom-parcel— patched in 19.0.2npm:react-server-dom-turbopack— patched in 19.0.2npm:react-server-dom-webpack— patched in 19.0.2npm:react-server-dom-parcel— patched in 19.1.3npm:react-server-dom-parcel— patched in 19.2.2npm:react-server-dom-turbopack— patched in 19.1.3npm:react-server-dom-turbopack— patched in 19.2.2npm:react-server-dom-webpack— patched in 19.1.3npm:react-server-dom-webpack— patched in 19.2.2
How to fix CVE-2025-55183
Fixed versions are recorded for 9 packages: npm:react-server-dom-parcel 19.0.2, npm:react-server-dom-turbopack 19.0.2, npm:react-server-dom-webpack 19.0.2, npm:react-server-dom-parcel 19.1.3, npm:react-server-dom-parcel 19.2.2, npm:react-server-dom-turbopack 19.1.3, npm:react-server-dom-turbopack 19.2.2, npm:react-server-dom-webpack 19.1.3, npm:react-server-dom-webpack 19.2.2. Vendor advisory: https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2025-55183
1 tracked threat in the Threadlinqs corpus references CVE-2025-55183, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on .