GHSA-5846-7QM3-R52J

Vulnerability from github – Published: 2026-07-31 16:58 – Updated: 2026-07-31 16:58
VLAI
Summary
dssrf: any users using 1.1.1.1 DNS is impacted by SSRF
Details

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:

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.');
}
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.0.4"
      },
      "package": {
        "ecosystem": "npm",
        "name": "dssrf"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.0.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54729"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-31T16:58:42Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "## Summary\n\nis_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.\n\n## POC\n\nExample to simulate 1.1.1.1 in version before 1.5.0 of dssrf:\n\n```js\nimport { is_url_safe } from \u0027../dist/helpers.js\u0027;\nimport dns from \u0027dns\u0027;\n\n\ndns.setServers([\u00271.1.1.1\u0027]);\n\nconst TARGET = \u0027http://localhost/admin\u0027;\n\nconsole.log(`Testing: ${TARGET}`);\nconsole.log(`Current DNS Servers: ${dns.getServers()}`);\n\nconst result = await is_url_safe(TARGET);\n\nif (result === true) {\n    console.log(\u0027dssrf treated localhost as SAFE because 1.1.1.1 returned NXDOMAIN.\u0027);\n} else {\n    console.log(\u0027dssrf blocked localhost.\u0027);\n}\n```",
  "id": "GHSA-5846-7qm3-r52j",
  "modified": "2026-07-31T16:58:42Z",
  "published": "2026-07-31T16:58:42Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/HackingRepo/dssrf-js/security/advisories/GHSA-5846-7qm3-r52j"
    },
    {
      "type": "WEB",
      "url": "https://github.com/HackingRepo/dssrf-js/pull/102"
    },
    {
      "type": "WEB",
      "url": "https://github.com/HackingRepo/dssrf-js/commit/668c21792cd1252baf779a176aa652e2b4c0067d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/HackingRepo/dssrf-js"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "dssrf: any users using 1.1.1.1 DNS is impacted by SSRF"
}



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