Is CVE-2026-61704 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-61704?

CVE-2026-61704 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-61704

Description

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.