How severe is CVE-2025-55182?

CVE-2025-55182 has a CVSS score of 10/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2025-55182?

CVE-2025-55182 affects the following packages: react-server-dom-webpack (npm), react-server-dom-webpack (npm), react-server-dom-webpack (npm), react-server-dom-turbopack (npm), react-server-dom-turbopack (npm), react-server-dom-turbopack (npm), react-server-dom-parcel (npm), react-server-dom-parcel (npm), and 1 more. Ecosystems affected: npm.

How do I fix CVE-2025-55182?

Update react-server-dom-webpack to version 19.0.1 or later. Run your dependency manager's update command and verify no transitive dependencies pin the vulnerable version. Use O3 Security's SCA scanner to confirm the fix is applied across your entire dependency tree.

Is CVE-2025-55182 actively exploited in the wild?

Yes. There are 111 known exploit references for CVE-2025-55182, including 1 documented proof-of-concept exploit on Exploit-DB. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2025-55182?

CVE-2025-55182 has an EPSS (Exploit Prediction Scoring System) score of 83.2%, placing it in the 99th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2025-55182 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2025-55182 (Meta React Server Components Remote Code Execution Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2025-12-05. CISA required all US federal civilian agencies to remediate this vulnerability by 2025-12-12. The required action was: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. This CVE has been used in known ransomware campaigns. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

Is there exploit tooling available for CVE-2025-55182?

A Nuclei detection template exists for CVE-2025-55182, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2025-55182 published, and has it been updated?

CVE-2025-55182 was published on December 3, 2025 and was last updated on April 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2025-12-05 — agencies required to remediate by 2025-12-12 · Ransomware

📦 npm

CVE-2025-55182

CRITICAL

React Server Components are Vulnerable to RCE

Also known asGHSA-fv66-9v8q-g76r

Published

Dec 3, 2025

Updated

Apr 10, 2026

Affected

9 pkgs

Patched

9 / 9

Exploits

111 known

EPSS Exploitation Probability

via FIRST.org ↗

83.2%probability of exploitation in next 30 days

Very High Risk99th percentile+1.19%

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

9 pkgs affected

📦react-server-dom-webpack📦react-server-dom-webpack📦react-server-dom-webpack📦react-server-dom-turbopack📦react-server-dom-turbopack📦react-server-dom-turbopack📦react-server-dom-parcel📦react-server-dom-parcel+1 more

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects npm packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

9 total 9 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`react-server-dom-webpack`	≥ 19.0.0&&< 19.0.1	19.0.1
📦npm	`react-server-dom-webpack`	≥ 19.1.0&&< 19.1.2	19.1.2
📦npm	`react-server-dom-webpack`	≥ 19.2.0&&< 19.2.1	19.2.1
📦npm	`react-server-dom-turbopack`	≥ 19.0.0&&< 19.0.1	19.0.1
📦npm	`react-server-dom-turbopack`	≥ 19.1.0&&< 19.1.2	19.1.2
📦npm	`react-server-dom-turbopack`	≥ 19.2.0&&< 19.2.1	19.2.1

Exploits & PoCs

111

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-52506webappsmultiple

React Server 19.2.0 - Remote Code Execution

by danieljavanrad · Apr 9, 2026

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2025-55182 in your stack?

O3 detects CVE-2025-55182 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works