# CVE-2026-2293: NestJS 11.1.13 - Lack of data validation allowing authentication/authorization bypass

> Attackers can bypass authentication and authorization middleware in NestJS applications using Fastify if path normalization is enabled.

- **Severity:** High 8.2 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 27 Feb 2026
- **Updated:** 15 Jul 2026
- **Also known as:** GHSA-r4wm-x892-vjmx

## What is CVE-2026-2293?

CVE-2026-2293 is a high-severity authentication bypass vulnerability in nest.js, published on 27 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A NestJS application using @nestjs/platform-fastify can allow bypass of authentication/authorization middleware when Fastify path-normalization options are enabled.

This issue affects nest.Js: 11.1.13.

Weakness: CWE-551 (Incorrect Behavior Order: Authorization Before Parsing and Canonicalization), CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2026-2293?

2 open source packages ship an affected version, including @nestjs/platform-fastify. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `@nestjs/platform-fastify` | npm | All versions | 11.1.14 |
| `@nestjs/platform-fastify` | npm | All versions | 11.1.14 |

Products: Nestjs Nest.

## How do I fix CVE-2026-2293?

Upgrade @nestjs/platform-fastify to 11.1.14 or later.

## Is CVE-2026-2293 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2293 exists.

## Other vulnerabilities in nest.js

- [CVE-2026-33011](https://insights.sbomify.com/CVE-2026-33011/): Nest Fastify HEAD Request Middleware Bypass (high 8.7)
- [CVE-2026-40879](https://insights.sbomify.com/CVE-2026-40879/): Nest: DoS via Recursive handleData in JsonSocket (TCP Transport) (high 7.5)
- [CVE-2025-69211](https://insights.sbomify.com/CVE-2025-69211/): Nest has a Fastify URL Encoding Middleware Bypass (TOCTOU) (medium 6.9)
- [CVE-2026-35515](https://insights.sbomify.com/CVE-2026-35515/): @nestjs/core Improperly Neutralizes Special Elements in Output Used by a Downstream Component ('Injection') (medium 6.3)
- [CVE-2024-29409](https://insights.sbomify.com/CVE-2024-29409/): nest allows a remote attacker to execute arbitrary code via the Content-Type header (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-2293 and fix it if it is affected.

What it is: CVE-2026-2293 is a high-severity authentication bypass vulnerability in nest.js, published on 27 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2293 exists.

Affected packages and fixed versions:
- @nestjs/platform-fastify (npm): affected all versions; fixed in 11.1.14
- @nestjs/platform-fastify (npm): affected all versions; fixed in 11.1.14

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-2293/ (Markdown: https://insights.sbomify.com/CVE-2026-2293/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-2293
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-2293
- OSV: https://osv.dev/vulnerability/CVE-2026-2293

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-2293/
Summaries are generated and may contain mistakes; the official description above is the record.