Vulnerability in Nestjs Nest
CVE-2025-69211
Nest is a framework for building scalable Node.js server-side applications. Versions prior to 11.1.11 have a Fastify URL encoding middleware bypass. A NestJS application is vulnerable if it uses `@nestjs/platform-fastify`; relies on `NestMiddleware` (via `MiddlewareConsumer`) for security checks (authentication, authorization, etc.), or through `app.use()`; and applies middleware to specific routes using string paths or controllers (e.g., `.forRoutes('admin')`). Exploitation can result in unauthenticated users accessing protected routes, restricted administrative endpoints becoming accessible to lower-privileged users, and/or middleware performing sanitization or validation being skipped. This issue is patched in `@nestjs/platform-fastify@11.1.11`.
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (32.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Nestjs Nest — versions < 11.1.11
Weakness classification (CWE)
References
- github.com/nestjs/nest/security/advisories/GHSA-8wpr-639p-ccrj (Exploit, Vendor Advisory)
- github.com/nestjs/nest/commit/c4cedda15a05aafec1e6045b36b0335ab850e771 (Patch)
Frequently asked questions
- What is CVE-2025-69211?
- CVE-2025-69211 is a high-severity vulnerability in Nestjs Nest, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.4/10. Published 2025-12-29.
- How severe is CVE-2025-69211?
- High severity. CVSS v3 base score is 7.4 out of 10.