CVE-2026-43897: Link Preview JS: vunerable to IPv6 and internal loopback attacks

Severity: high (CVSS 8.7 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-11 · updated 2026-10-26
Weakness: CWE-918

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.

Affected products

OP-Engineering link-preview-js: before 4.0.1

References

https://github.com/OP-Engineering/link-preview-js/commit/4396d48909fab37553c0e93e26447fe218363ede
https://github.com/OP-Engineering/link-preview-js/pull/179
https://github.com/OP-Engineering/link-preview-js/releases/tag/4.0.1
https://github.com/OP-Engineering/link-preview-js/security/advisories/GHSA-4gp8-rjrq-ch6q

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