CVE-2026-33011 Nest Fastify HEAD Request Middleware Bypass
Attackers can bypass GET middleware in NestJS Fastify applications by sending HEAD requests, potentially skipping security checks while executing handlers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-33011?
CVE-2026-33011 is a high-severity vulnerability in nestjs nest, published on 20 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Nest is a framework for building scalable Node.js server-side applications. In versions 11.1.15 and below, a NestJS application using @nestjs/platform-fastify GET middleware can be bypassed because Fastify automatically redirects HEAD requests to the corresponding GET handlers (if they exist). As a result: middleware will be completely skipped, the HTTP response won't include a body (since the response is truncated when redirecting a HEAD request to a GET handler), and the actual handler will still be executed. This issue is fixed in version 11.1.16.
Weakness: CWE-670
Which versions are affected by CVE-2026-33011?
2 open source packages ship an affected version, including @nestjs/platform-fastify. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@nestjs/platform-fastify npm | All versions | 11.1.16 |
@nestjs/platform-fastify npm | All versions | 11.1.16 |
Products include Nestjs Nest.
How do I fix CVE-2026-33011?
Upgrade @nestjs/platform-fastify to 11.1.16 or later.
Is CVE-2026-33011 being exploited?
There is no known exploitation of CVE-2026-33011 in the wild and no public exploit code.
Other vulnerabilities in nestjs nest
- CVE-2026-2293 NestJS 11.1.13 - Lack of data validation allowing authentication/authorization bypass
- CVE-2026-40879 Nest: DoS via Recursive handleData in JsonSocket (TCP Transport)
- CVE-2025-69211 Nest has a Fastify URL Encoding Middleware Bypass (TOCTOU)
- CVE-2026-35515 @nestjs/core Improperly Neutralizes Special Elements in Output Used by a Downstream Component ('Injection')
- CVE-2024-29409 nest allows a remote attacker to execute arbitrary code via the Content-Type header
Sources
Also known as GHSA-wf42-42fg-fg84.