link-preview-js vulnerable to IPv6 and internal loopback attacks
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
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | link-preview-js | < 4.0.1 | 4.0.1 |
References
- https://github.com/OP-Engineering/link-preview-js/security/advisories/GHSA-4gp8-rjrq-ch6q
- https://nvd.nist.gov/vuln/detail/CVE-2026-43897
- https://github.com/OP-Engineering/link-preview-js/pull/179
- https://github.com/OP-Engineering/link-preview-js/commit/4396d48909fab37553c0e93e26447fe218363ede
- https://github.com/OP-Engineering/link-preview-js
- https://github.com/OP-Engineering/link-preview-js/releases/tag/4.0.1
- CVSS vector
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- Weakness (CWE)
CWE-918- Platform
- npm
- Package
link-preview-js- Disclosed
- 05.05.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-4gp8-rjrq-ch6q - CC BY 4.0
Vulnerability history: link-preview-js
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 07.2022 09.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
- Medium 1
Disclosures per year
- 2022: 1
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 2
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