Known exploited vulnerability
CVE-2025-55182
The short answer
CVE-2025-55182 affects Meta react-server-dom-webpack and is rated critical (CVSS 10.0). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-12-05: attackers are using it, so patch it first. Fixed versions are published for react-server-dom-webpack (19.0.1, 19.1.2, 19.2.1) and react-server-dom-turbopack (19.0.1, 19.1.2, 19.2.1).
What it is
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.
Weakness: CWE-502.
Severity
10.0 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Dec 5, 2025
Federal due date Dec 12, 2025
EPSS, next 30 days
100%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected packages and fixed versions
| Package | Ecosystem | Fixed in | Advisory |
|---|---|---|---|
| react-server-dom-webpack | npm | 19.0.1, 19.1.2, 19.2.1 | GHSA-fv66-9v8q-g76r |
| react-server-dom-turbopack | npm | 19.0.1, 19.1.2, 19.2.1 | GHSA-fv66-9v8q-g76r |
| react-server-dom-parcel | npm | 19.0.1, 19.1.2, 19.2.1 | GHSA-fv66-9v8q-g76r |
Is it in your code? Drop your lockfile into the free vulnerability check, or let vulnerability watch check your repository every day and open the upgrade as a pull request.
Affected products
react-server-dom-webpack, react-server-dom-turbopack, react-server-dom-parcel. NVD's record lists the exact affected versions.
References
- react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components PatchVendor Advisory
- www.facebook.com/security/advisories/cve-2025-55182 Vendor Advisory
- news.ycombinator.com/item?id=46136026 Issue Tracking
- aws.amazon.com/blogs/security/china-nexus-cyber-threat-groups-rapidly-exploit-react2shell-vulnerability-cve-2025-55182/ Third Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55182 US Government Resource
Questions
Is CVE-2025-55182 being exploited?
Yes. CISA added CVE-2025-55182 to its Known Exploited Vulnerabilities catalog on 2025-12-05, with a federal remediation due date of 2025-12-12. CISA lists it as used in ransomware campaigns.
How do I fix CVE-2025-55182?
Upgrade to a fixed version: react-server-dom-webpack (npm) 19.0.1 or 19.1.2 or 19.2.1; react-server-dom-turbopack (npm) 19.0.1 or 19.1.2 or 19.2.1; react-server-dom-parcel (npm) 19.0.1 or 19.1.2 or 19.2.1. CISA's required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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