CVE-2025-55184
HIGHCVE-2025-55184 is a high-severity (CVSS 7.5) Deserialization of Untrusted Data vulnerability in react-server-dom-parcel. 3 public exploit references exist, so weaponization risk is real. O3 Security confirms whether CVE-2025-55184 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Denial of Service Vulnerability in React Server Components
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
A pre-authentication denial of service vulnerability exists in 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. The vulnerable code unsafely deserializes payloads from HTTP requests to Server Function endpoints, which can cause an infinite loop that hangs the server process and may prevent future HTTP requests from being served.
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.
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-2025-55184 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-2025-55184 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-2025-55184. 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-2025-55184 in your dependencies?
O3 detects CVE-2025-55184 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.