CVE-2026-43897

Received Received - Intake

Link Preview JS IPv6 Loopback and DNS Spoofing Vulnerabilities

Publication date: 2026-05-11

Last updated on: 2026-05-11

Assigner: GitHub, Inc.

Description

Link Preview JS extracts web links information. Prior to 4.0.1, the library did not check for IPv6 loopback attacks. There was also a DNS attack, where an address could be resolved into an internal IP. This could cause internal data leaks. This vulnerability is fixed in 4.0.1.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-05-11

Last Modified

2026-05-11

Generated

2026-07-11

AI Q&A

2026-05-12

EPSS Evaluated

2026-07-10

NVD

CVE-2026-43897

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE

KEV

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

Executive Summary

The vulnerability exists in the Link Preview JS library prior to version 4.0.1. The library extracts information from web links but did not properly check for IPv6 loopback attacks. Additionally, there was a DNS attack vulnerability where an address could be resolved into an internal IP address. These issues could lead to internal data leaks.

Impact Analysis

This vulnerability can lead to internal data leaks by allowing attackers to exploit IPv6 loopback and DNS resolution attacks. This means that sensitive internal network information could be exposed to unauthorized parties, potentially compromising the security of internal systems.

Mitigation Strategies

To mitigate this vulnerability, upgrade the Link Preview JS library to version 4.0.1 or later, as this version includes fixes for the IPv6 loopback and DNS attacks that could cause internal data leaks.

Compliance Impact

The vulnerability in Link Preview JS prior to version 4.0.1 could lead to internal data leaks due to IPv6 loopback and DNS attacks resolving addresses into internal IPs.

Such internal data leaks may impact compliance with data protection regulations like GDPR and HIPAA, which require safeguarding sensitive and internal information from unauthorized disclosure.

However, specific details on compliance impact or mitigation steps related to these standards are not provided in the available information.

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