# CVE-2025-67779: Meta react-server-dom-parcel

- Exploited (CISA KEV): no
- Published: 2025-12-11
- CVSS: 7.5 HIGH (v3.1)
- EPSS: no score

It was found that the fix addressing CVE-2025-55184 in React Server Components was incomplete and does not prevent a denial of service attack in a specific case. React Server Components versions 19.0.2, 19.1.3 and 19.2.2 are affected, allowing unsafe deserialization of payloads from HTTP requests to Server Function endpoints. This 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 | No public claim | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| Vercel | Blocks by default | 2025-12-11 | 0 |
| F5 | No public claim | — | — |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### Vercel

- 2025-12-11 · new · default Block
  > We created new rules to address these vulnerabilities and deployed them to the Vercel WAF to automatically protect all projects hosted on Vercel at no cost.
  Source: https://vercel.com/changelog/react-server-components-security-update-dos-and-source-code-exposure
- 2025-12-11 · new · default Block
  > We created new rules to address these vulnerabilities and deployed them to the Vercel WAF to automatically protect all projects hosted on Vercel at no cost.
  Source: https://vercel.com/kb/bulletin/security-bulletin-cve-2025-55184-and-cve-2025-55183

"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-2025-67779 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2025-67779