CVE-2025-55184
Published: 11 December 2025
Summary
CVE-2025-55184 is a high-severity Deserialization of Untrusted Data (CWE-502) vulnerability in Vercel Next.Js. Its CVSS base score is 7.5 (High).
Operationally, ranked in the top 2.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
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 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 flaw is tracked as CWE-502 and carries a CVSS 3.1 score of 7.5.
An unauthenticated remote attacker can exploit the issue by sending crafted requests to the affected Server Function endpoints, achieving denial of service through server process hangs without any authentication or user interaction required.
Public advisories addressing the vulnerability are published at https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components, https://www.facebook.com/security/advisories/cve-2025-55184, and https://github.com/KingHacker353/CVE-2025-55184. The associated EPSS score has remained flat at 0.4124 with no material rise observed.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-202877
Vulnerability details
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…
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endpoints, which can cause an infinite loop that hangs the server process and may prevent future HTTP requests from being served.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing supplies malicious serialized objects, detecting unsafe deserialization and supporting corrective actions.
Evaluation of untrusted data handling (deserialization testing) reveals unsafe processing, which the required remediation process addresses.
Untrusted serialized data can be deserialized and observed inside the chamber, blocking gadget-chain exploitation outside the sandbox.
Validates or rejects untrusted serialized data before deserialization occurs.
Identifies and blocks malicious code introduced through deserialization of untrusted data at system boundaries.
Integrity verification of serialized information can detect tampering before deserialization occurs.
Provenance of associated data allows detection of untrusted sources before deserialization or processing occurs.