GHSA-4gp8-rjrq-ch6q

Source

https://github.com/advisories/GHSA-4gp8-rjrq-ch6q

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-4gp8-rjrq-ch6q/GHSA-4gp8-rjrq-ch6q.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-4gp8-rjrq-ch6q

Aliases

CVE-2026-43897

Published

2026-05-05T20:13:02Z

Modified

2026-05-13T14:35:04.660604Z

Severity

8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

link-preview-js vulnerable to IPv6 and internal loopback attacks

Details

Impact

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.

Patches

Problem has been patched in version 4.0.1. However, it cannot be completely solved by the package alone. The regex used for validation has been tightened for IPv6 addresses.

The DNS resolving, however, is more difficult. The regex has been tightened to prohibit .internal, .local, .nip.io and .sslip.io addresses, however there can be other services not on the list, therefore it is imperative that users use the resolveDNSHost option to do DNS resolution before fetching content. To that regard a (scary) error message has been added when the option is not set.

Workarounds

Users can do their own validation before fetching content.

Reported by https://github.com/Andrew-most-likely

Database specific

{
    "github_reviewed_at": "2026-05-05T20:13:02Z",
    "nvd_published_at": "2026-05-11T22:22:14Z",
    "cwe_ids": [
        "CWE-918"
    ],
    "severity": "HIGH",
    "github_reviewed": true
}

References

Affected packages

npm / link-preview-js

Package

Name: link-preview-js; View open source insights on deps.dev
Purl: pkg:npm/link-preview-js

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

4.0.1

Database specific

last_known_affected_version_range

"<= 4.0.0"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-4gp8-rjrq-ch6q/GHSA-4gp8-rjrq-ch6q.json"