🛡️ CVE-2026-54729 — dssrf

dssrf: any users using 1.1.1.1 DNS is impacted by SSRF

Summary

is_url_safe can treat localhost as safe when DNS resolver 1.1.1.1 returns NXDOMAIN because dns.resolve4 yields no address and no dns.lookup fallback occurs, allowing server-side request forgery.

POC

Example to simulate 1.1.1.1 in version before 1.5.0 of dssrf:

```js

import { is_url_safe } from '../dist/helpers.js';

import dns from 'dns';

dns.setServers(['1.1.1.1']);

const TARGET = 'http://localhost/admin';

console.log(Testing: ${TARGET});

console.log(Current DNS Servers: ${dns.getServers()});

const result = await is_url_safe(TARGET);

if (result === true) {

console.log('dssrf treated localhost as SAFE because 1.1.1.1 returned NXDOMAIN.');

} else {

console.log('dssrf blocked localhost.');

}

```