CVE-2025-55182

CRITICAL CISA KEV

Published Dec 3, 2025 Modified Dec 10, 2025 CWE-502

Description

CVSS v3.1 Score

10.0

CRITICAL

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

CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild.

Added: Dec 5, 2025 Remediation due: Dec 12, 2025 Known ransomware use

Weakness Type (CWE)

CWE-502 Deserialization of Untrusted Data

Affected Products

Vendor	Product	Versions
facebook	react	All
facebook	react	All
facebook	react	All
facebook	react	All
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	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All
vercel	next.js	All

References

Advisories & Patches

https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components https://www.facebook.com/security/advisories/cve-2025-55182 http://www.openwall.com/lists/oss-security/2025/12/03/4

Other References

https://news.ycombinator.com/item?id=46136026 https://aws.amazon.com/blogs/security/china-nexus-cyber-threat-groups-rapidly-exploit-react2shell-vulnerability-cve-2025-55182/ https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55182

Frequently Asked Questions

What is CVE-2025-55182? +

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. It has a CVSS v3.1 base score of 10.0 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2025-55182? +

CVE-2025-55182 has a CVSS v3.1 score of 10.0 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-55182? +

CVE-2025-55182 affects products from facebook, vercel, specifically: next.js, react. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-55182? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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Quick Facts

CVSS Score: 10.0
Severity: CRITICAL
Published: Dec 3, 2025
KEV: Active Exploit

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