# CVE-2026-66362: NGF vulnerability

> Authenticated attackers can inject arbitrary NGINX directives via unsanitized fields in Authentication Filter resources, potentially compromising the control plane.

- **Severity:** High 8.6 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 2 Sep 2026
- **Updated:** 3 Sep 2026
- **Also known as:** BIT-nginx-gateway-fabric-2026-66362, GHSA-94x9-2xmh-58p8

## What is CVE-2026-66362?

CVE-2026-66362 is a high-severity code injection vulnerability in F5 NGINX Gateway Fabric, published on 2 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Description:
When NGINX Plus is configured as the data plane for NGINX Gateway Fabric, an injection vulnerability exists in the NGINX configuration generator component of NGINX Gateway Fabric. User-supplied string values from the Authentication Filter Custom Resource Definition clientID or cookieName fields, or in the clientSecret field of a Secret referenced by an Authentication Filter, are rendered directly into NGINX configuration templates without sanitization or escaping. 

Impact:
An authenticated attacker with permission to create or modify these resources may craft values that inject arbitrary NGINX configuration directives. This is a control plane issue; there is no data plane exposure.

Weakness: CWE-76 (Improper Neutralization of Equivalent Special Elements)

## Which versions are affected by CVE-2026-66362?

1 open source package ship an affected version, including nginx-gateway-fabric.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `nginx-gateway-fabric` | Bitnami | From 2.5.0 | 2.6.8 |

## How do I fix CVE-2026-66362?

Upgrade nginx-gateway-fabric to 2.6.8 or later.

## Is CVE-2026-66362 being exploited?

There is no known exploitation of CVE-2026-66362 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-66362 and fix it if it is affected.

What it is: CVE-2026-66362 is a high-severity code injection vulnerability in F5 NGINX Gateway Fabric, published on 2 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-66362 in the wild and no public exploit code.

Affected packages and fixed versions:
- nginx-gateway-fabric (Bitnami): affected from 2.5.0; fixed in 2.6.8

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-2026-66362/ (Markdown: https://insights.sbomify.com/CVE-2026-66362/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-66362
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-66362
- OSV: https://osv.dev/vulnerability/CVE-2026-66362

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-66362/
Summaries are generated and may contain mistakes; the official description above is the record.