# F5 DoS for NGINX 4.12

Type of document: Reference
Product: F5 DoS for NGINX
> Release notes for F5 DoS for NGINX 4.12, which adds support for NGINX Plus R37.2 and removes Debian 11 support.

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F5 DoS for NGINX provides behavioral protection against denial-of-service (DoS) attacks for your web applications.

## Release 4.12

October 14, 2026

### New features

- NGINX Plus R37.2 support

**Note:** 
Debian 11 support was removed in 4.11 and is not reinstated in 4.12.

### Supported packages

| Distribution name          | Package file                                          |
|----------------------------|-------------------------------------------------------|
| Alpine 3.21                | _app-protect-dos-37+4.12.0-r1.apk_                    |
| Alpine 3.22                | _app-protect-dos-37+4.12.0-r1.apk_                    |
| Amazon Linux 2023          | _app-protect-dos-37+4.12.0-1.amzn2023.ngx.x86_64.rpm_ |
| RHEL 8 and Rocky Linux 8   | _app-protect-dos-37+4.12.0-1.el8.ngx.x86_64.rpm_      |
| RHEL 9 and Rocky Linux 9   | _app-protect-dos-37+4.12.0-1.el9.ngx.x86_64.rpm_      |
| RHEL 10 and Rocky Linux 10 | _app-protect-dos-37+4.12.0-1.el10.ngx.x86_64.rpm_     |
| Debian 12                  | _app-protect-dos_37+4.12.0-1\~bookworm_amd64.deb_     |
| Debian 13                  | _app-protect-dos_37+4.12.0-1\~trixie_amd64.deb_       |
| Ubuntu 22.04               | _app-protect-dos_37+4.12.0-1\~jammy_amd64.deb_        |
| Ubuntu 24.04               | _app-protect-dos_37+4.12.0-1\~noble_amd64.deb_        |
| NGINX Plus                 | _NGINX Plus R37.2_                                    |

### Important notes

- F5 DoS for NGINX 4.12 requires NGINX Plus **R37.2**, whereas 4.11 requires **R37.0**. Each `nginx-plus-module-appprotectdos` package depends on a virtual package named `nginx-plus-r<RELEASE>`. `<RELEASE>` is the NGINX Plus release number. Only the matching NGINX Plus release provides that package, so update F5 DoS for NGINX and NGINX Plus together.
- On Debian and Ubuntu, `apt` installs only the newest `nginx-plus` and won't choose an older one. When you install a specific F5 DoS for NGINX version, pin `nginx-plus` too. Otherwise, the install fails with "Unable to correct problems, you have held broken packages". For the exact commands, see the [F5 DoS for NGINX Deployment Guide](/nap-dos/deployment-guide/learn-about-deployment.md).
- If you use L4 accelerated mitigation, pin `app-protect-dos-ebpf-manager` to the same version as `app-protect-dos`. An unpinned package installs the newest version, which can differ from your other packages.
- Debian 11 reached end of life and is no longer supported. If you run Debian 11, upgrade to Debian 12 or Debian 13 before you update to 4.12.