CVE-2026-54729
Received Received - Intake

DSSRF Library Server-Side Request Forgery via Localhost Bypass

Publication date: 2026-07-31

Last updated on: 2026-07-31

Assigner: GitHub, Inc.

Description
DSSRF is a Node.js library that provides a wide range of utilities and advanced SSRF defense checks. Prior to 1.0.5, 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. This issue is fixed in version 1.0.5.

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Meta Information

Published
2026-07-31
Last Modified
2026-07-31
Generated
2026-07-31
AI Q&A
2026-07-31
EPSS Evaluated
N/A
NVD
CVE-2026-54729
EUVD
EUVD-2026-51574

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-918 The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

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Executive Summary

DSSRF is a Node.js library with SSRF defense checks. Before version 1.0.5, the is_url_safe function incorrectly treated localhost as safe when DNS resolver 1.1.1.1 returns NXDOMAIN. This happens because dns.resolve4 finds no address and no fallback to dns.lookup occurs, enabling server-side request forgery.

Impact Analysis

An attacker could exploit this to bypass SSRF protections and make unauthorized requests to internal systems via localhost, potentially accessing sensitive data or services.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR (data protection) and HIPAA (health data privacy) by exposing sensitive information.

Mitigation Strategies

Update the DSSRF library to version 1.0.5 or later to address the SSRF vulnerability where localhost may be treated as safe due to DNS resolver behavior.

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