# CVE-2025-55184: Meta react-server-dom-webpack

- Exploited (CISA KEV): no
- Published: 2025-12-11
- CVSS: 7.5 HIGH (v3.1)
- EPSS: 66.6% (99th percentile)

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.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Rule off by default | 2025-12-11 | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2025-12-12 | 1 |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### Cloudflare

- 2025-12-11 · updated · rule 2694f1610c0b471393b21aef102ec699 · default Disabled
  > React - DoS - CVE:CVE-2025-55184. Previous action: N/A. New action: Disabled. This was labeled as Generic – Server Function Resource Exhaustion.
  Source: https://developers.cloudflare.com/changelog/post/2025-12-11-emergency-waf-release/

### F5

- 2025-12-12 · new · rule 200012097
  > Added: signature 200012097 "Next.js Denial of Service" (Denial of Service, risk High), systems: Node.js, JavaScript, ReactJS. References: CVE-2025-55184.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog

## Our test (measured)

- OWASP Core Rule Set 4.25.0, paranoia level 1, anomaly threshold 5, default CRS settings: passed (0 of 3 requests blocked), template CVE-2025-55184, 2026-11-02
- OWASP Core Rule Set 4.25.0, paranoia level 2, anomaly threshold 5, default CRS settings: partial (1 of 3 requests blocked), template CVE-2025-55184, 2026-11-02

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2025-55184 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2025-55184