Critical 10.0Known exploited (CISA KEV)Published Dec 3, 2025

CVE-2025-55182A 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…

Updated under an hour ago (Oct 27, 2026, 12:23 AM ET)

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It affects Meta react-server-dom-webpack and 4 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Dec 5, 2025; federal agencies had to remediate by Dec 12, 2025, and it is known to be used in ransomware. Treat that date as your deadline.

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Every CVE for Meta react-server-dom-webpack

Exploited in the last 30 days

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.

CVSS: 10.0 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-502
Known exploited: Added to CISA KEV Dec 5, 2025; federal remediation due Dec 12, 2025; known ransomware useApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 99.80% (percentile 100)
Assigned by: Meta
NVD analysis: Analyzed
Record last updated: Oct 7, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Meta react-server-dom-webpack meta:react_server_dom_webpack (from the name)	from 19.0.0 through 19.0.0; from 19.1.0 through 19.1.1; from 19.2.0 through 19.2.0	CNA record
Meta react-server-dom-turbopack meta:react_server_dom_turbopack (from the name)	from 19.0.0 through 19.0.0; from 19.1.0 through 19.1.1; from 19.2.0 through 19.2.0	CNA record
Meta react-server-dom-parcel meta:react_server_dom_parcel (from the name)	from 19.0.0 through 19.0.0; from 19.1.0 through 19.1.1; from 19.2.0 through 19.2.0	CNA record
facebook react facebook:react	19.0.0; 19.1.0; 19.1.1; 19.2.0	NVD
vercel next.js vercel:next.js	from 15.0.0 before 15.0.5; from 15.1.0 before 15.1.9; from 15.2.0 before 15.2.6; from 15.3.0 before 15.3.6; from 15.4.0 before 15.4.8; from 15.5.0 before 15.5.7; from 16.0.0 before 16.0.7; 14.3.0; and 70 more ranges	NVD

References

References

https://www.facebook.com/security/advisories/cve-2025-55182	x-refsource-confirm, vendor-advisory
https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components	x-refsource-confirm, patch, vendor-advisory
http://www.openwall.com/lists/oss-security/2025/12/03/4	mailing-list, patch, third-party-advisory
https://news.ycombinator.com/item?id=46136026	issue-tracking
https://aws.amazon.com/blogs/security/china-nexus-cyber-threat-groups-rapidly-exploit-react2shell-vulnerability-cve-2025-55182/	third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55182	us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.