CVE-2025-55183
MEDIUMSource Code Exposure Vulnerability in React Server Components
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Blast Radius
Weekly download volume for affected packages — a proxy for how broadly this vulnerability is deployed.
react-server-dom-parcelnpmreact-server-dom-turbopacknpmreact-server-dom-webpacknpmDescription
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.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | react-server-dom-parcel | ≥ 19.0.0&&< 19.0.2 | 19.0.2 |
| 📦npm | react-server-dom-turbopack | ≥ 19.0.0&&< 19.0.2 | 19.0.2 |
| 📦npm | react-server-dom-webpack | ≥ 19.0.0&&< 19.0.2 | 19.0.2 |
| 📦npm | react-server-dom-parcel | ≥ 19.1.0&&< 19.1.3 | 19.1.3 |
| 📦npm | react-server-dom-parcel | ≥ 19.2.0&&< 19.2.2 | 19.2.2 |
| 📦npm | react-server-dom-turbopack | ≥ 19.1.0&&< 19.1.3 | 19.1.3 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
williavs/nextjs-security-update
Batch upgrade all your Next.js apps to patched versions - fight back aga
kimtruth/CVE-2025-55183-poc
PoC for CVE-2025-55183
X-Cotang/CVE-2025-55183_POC
CVE-2025-55183 POC
StealthMoud/react-server-cve-lab
Security research lab for CVE-2025-55183 and CVE-2025-55184 in React Ser
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for react-server-dom-parcel. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update react-server-dom-parcel to 19.0.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-55183 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether CVE-2025-55183 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to CVE-2025-55183. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2025-55183 in your dependencies?
O3 detects CVE-2025-55183 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.