How severe is CVE-2025-55184?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2025-55184 known to be exploited?

12 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Meta React-server-dom-parcel

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…

EPSS: 0.412 (97.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Meta React-server-dom-parcel — versions 19.0.0, 19.1.0, 19.2.0
Meta React-server-dom-turbopack — versions 19.0.0, 19.1.0, 19.2.0
Meta React-server-dom-webpack — versions 19.0.0, 19.1.0, 19.2.0

Public proof-of-concept exploits

References

www.facebook.com/security/advisories/cve-2025-55184 (x_refsource_CONFIRM)
react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-s… (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2025-55184?: CVE-2025-55184 is a high-severity vulnerability in Meta React-server-dom-parcel. CVSS score: 7.5/10. Published 2025-12-11.
How severe is CVE-2025-55184?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2025-55184 known to be exploited?: 12 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.