CVE-2026-61704 link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897
An attacker can bypass SSRF protections via DNS rebinding to access internal network resources using the link-preview-js library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-61704?
CVE-2026-61704 is a high-severity server-side request forgery vulnerability in OP-Engineering link-preview-js, published on 20 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-61704?
2 open source packages ship an affected version, including link-preview-js.
| Package | Affected | Fixed in |
|---|---|---|
link-preview-js npm | All versions | 4.0.4 |
link-preview-js npm | All versions | 4.0.4 |
How do I fix CVE-2026-61704?
Upgrade link-preview-js to 4.0.4 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-61704 being exploited?
There is no known exploitation of CVE-2026-61704 in the wild and no public exploit code.
Sources
Also known as GHSA-cpjf-6666-r8fx.