Vulnerability · Published May 11, 2026 · Assigned by GitHub_M

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

High 8.7

In plain English

A high-severity server-side request forgery in link-preview-js from OP-Engineering. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)0.7%top 48.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	link-preview-js	4.0.1	GHSA-4gp8-rjrq-ch6q

Affected products (as reported)

Vendor	Product	Versions
OP-Engineering	link-preview-js	< 4.0.1

Weakness: CWE-918 · 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

References

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