CVE-2025-53859 · cross-distro fix matrix

CVE-2025-53859: NGINX Open Source and NGINX Plus have a vulnerability in the ngx_mail_smtp_module that might allow an unauthenticated attacker to over-read NGINX SMTP authentication process memory; as a result, the server side may leak arbitrary bytes sent in a request to the authentication server. This issue happe

Affects 3 Linux releases across 3 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2025-53859 has a known fix. Run the listed command on that distro to remediate.

Debian bookworm

Source: Debian Security Tracker

nginx→ fixed in1.22.1-9+deb12u3urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y nginx
```

Debian trixie

Source: Debian Security Tracker

nginx→ fixed in1.26.3-3+deb13u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y nginx
```

Alpine edge

Source: Alpine secdb

nginx→ fixed in1.28.2-r0
```
apk update && apk add --upgrade nginx
```

Are YOU affected by CVE-2025-53859?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

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