CVE-2025-55182

Name: CVE-2025-55182
Creator: NVD / NIST
Published: 2025-12-03T16:15:56.463+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 10/10Actively ExploitedEPSS 99.56%

Last modified Jun 17, 2026

CVE-2025-55182 is a critical-severity vulnerability rated 10/10 on the CVSS scale. 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.. CISA has confirmed active exploitation in the wild. EPSS estimates a 99.56% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

10/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS Probability

99.56%

99.9th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Dec 12, 2025.

Weakness Enumeration

CWE-502

Affected Software

Vendor	Product	Versions	Update
Facebook	React	19.0.0	—
Facebook	React	19.1.0	—
Facebook	React	19.1.1	—
Facebook	React	19.2.0	—
Vercel	Next.Js	>= 15.0.0, < 15.0.5	—
Vercel	Next.Js	>= 15.1.0, < 15.1.9	—
Vercel	Next.Js	>= 15.2.0, < 15.2.6	—
Vercel	Next.Js	>= 15.3.0, < 15.3.6	—
Vercel	Next.Js	>= 15.4.0, < 15.4.8	—
Vercel	Next.Js	>= 15.5.0, < 15.5.7	—
Vercel	Next.Js	>= 16.0.0, < 16.0.7	—
Vercel	Next.Js	14.3.0	Canary77
Vercel	Next.Js	15.6.0	—
Vercel	Next.Js	16.0.0	—

References

https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-componentsPatch, Vendor Advisory
https://www.facebook.com/security/advisories/cve-2025-55182Vendor Advisory
http://www.openwall.com/lists/oss-security/2025/12/03/4Mailing List, Patch, Third Party Advisory
https://news.ycombinator.com/item?id=46136026Issue 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-2025-55182US Government Resource

Timeline

Published: Dec 3, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-55182?

How severe is CVE-2025-55182?

CVE-2025-55182 has a CVSS score of 10/10 (CRITICAL severity). The EPSS model estimates a 99.56% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2025-55182?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-55182?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST