GHSA-fv66-9v8q-g76r: react-server-dom-webpack (CVE-2025-55182)

React Server Components are Vulnerable to RCE

CVSS 10.0 CriticalCriticalIn CISA KEV · ransomwareEPSS 1.00 · 99th percentile

Critical, because:

In CISA’s KEV catalogue since 5 Dec 2025: it is known to be exploited.
CVSS score 10.0: 9.0 or more.
CVSS score 10.0 (7.0 or more) and EPSS 1.00 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

Published by the GitHub Advisory Database at 3 Dec 2025, 19:07 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
react-server-dom-webpack	npm	>=19.0.0, <19.0.1 \|\| >=19.1.0, <19.1.2 \|\| >=19.2.0, <19.2.1	19.0.1, 19.1.2, 19.2.1
react-server-dom-turbopack	npm	>=19.0.0, <19.0.1 \|\| >=19.1.0, <19.1.2 \|\| >=19.2.0, <19.2.1	19.0.1, 19.1.2, 19.2.1
react-server-dom-parcel	npm	>=19.0.0, <19.0.1 \|\| >=19.1.0, <19.1.2 \|\| >=19.2.0, <19.2.1	19.0.1, 19.1.2, 19.2.1

Identifiers

GHSA-fv66-9v8q-g76r · CVE-2025-55182

Weakness (CWE)

CWE-502

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
10.0	Critical	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H	CNA (Meta)

CISA KEV Listed since 5 Dec 2025: known to be exploited. CISA reports use in ransomware campaigns.
EPSS 1.00, the 99th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

3 Dec 2025, 15:48 UTC Published by the maintainers as a GitHub repository advisory

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.