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CVE-2026-61704

link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897

Link Preview JS extracts web links information. Prior to 4.0.4, the resolveDNSHost mitigation in index.ts validates one resolved IP address but fetches the original hostname, allowing an attacker-controlled DNS server to return a public address during validation and a loopback or internal address during the final connection. This DNS rebinding condition bypasses the SSRF protection and can cause the server-side preview fetch to reach internal HTTP resources. Redirect handling is affected by the same validation-to-fetch mismatch. This issue is fixed in version 4.0.4.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Op-engineering
Products
Link-preview-js
CVE-2026-43897

Link Preview JS: vunerable to IPv6 and internal loopback attacks

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 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Op-engineering
Products
Link-preview-js