Threat Intelligence / CVE / CVE-2025-55184

CVE-2025-55184 — Facebook React

CVSS v3.1 7.5 (HIGH) · EPSS 21.0% (higher than 95.6% of all scored CVEs) · Priority 7.6/10 · Published 2025-12-11

As of 2025-12-15, CVE-2025-55184 is a HIGH-severity vulnerability in Facebook React, CVSS v3.1 7.5, EPSS 21.0% (95.6th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2025-55184, most recently “React2Shell CVE-2025-55182 — Multiple Threat Actors Actively Exploiting React Server Components RCE (CVSS 10.0)”.

Last updated: 2025-12-15

What is CVE-2025-55184?

A pre-authentication denial of service vulnerability exists in React Server Components versions 19.0.0, 19.0.1 19.1.0, 19.1.1, 19.1.2, 19.2.0 and 19.2.1, 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, which can cause an infinite loop that hangs the server process and may prevent future HTTP requests from being served.

The record classifies CVE-2025-55184 under weakness class CWE-502. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on availability. 83 affected-product entries are recorded, across 2 vendors, listed below. The identifier was first published 276 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 7.5 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (FIRST): 21.0% probability of exploitation in the next 30 days, higher than 95.6% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 7.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2025-12-11, last modified 2025-12-15

Is CVE-2025-55184 being exploited?

It currently carries a trending score of 29 in the Threadlinqs vulnerability feed.

Affected products and versions

Facebook: React
Vercel: Next.js, Next.js 15.6.0, Next.js 16.1.0

Showing 4 of 83 recorded product entries.

How to fix CVE-2025-55184

Vendor advisory: https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2025-55184

1 tracked threat in the Threadlinqs corpus references CVE-2025-55184, either in the campaign’s CVE list or as an indicator on the campaign record.

React2Shell CVE-2025-55182 — Multiple Threat Actors Actively Exploiting React Server Components RCE (CVSS 10.0) — CRITICAL · 2026-02-13

Sources

Seeded from nvd and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2025-55184 are available via the Threadlinqs MCP server (Purple tier). View plans →

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