link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897
The existing advisory GHSA-4gp8-rjrq-ch6q / CVE-2026-43897 states that the SSRF issue was fixed in 4.0.1. However, 4.0.3 remains bypassable when the documented resolveDNSHost mitigation is used.
Root cause: The library validates one resolved IP address through resolveDNSHost, but later performs fetch() against the original hostname without pinning the connection to the validated IP. An attacker-controlled DNS server can return a public IP during validation and a loopback/internal IP during the final connection.
Impact: This allows an attacker to bypass the documented SSRF mitigation and make the server-side fetch reach loopback or internal addresses under DNS rebinding conditions.
This appears to be either an incomplete fix for CVE-2026-43897 or a new DNS rebinding SSRF bypass affecting the latest version.
The PoC was reproduced in a local-only controlled environment to avoid targeting production or third-party systems. Evidence and reproduction details can be provided privately.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | link-preview-js | < 4.0.4 | 4.0.4 |
Referencias
- https://github.com/OP-Engineering/link-preview-js/security/advisories/GHSA-cpjf-6666-r8fx
- https://nvd.nist.gov/vuln/detail/CVE-2026-61704
- https://github.com/OP-Engineering/link-preview-js/pull/181
- https://github.com/OP-Engineering/link-preview-js/commit/6ee25043dd60b097eb70b4ce049aac94b28239e3
- https://github.com/OP-Engineering/link-preview-js/commit/f3a3dd84adbb9d32d06a933f44ff3eaa837f9a12
- https://github.com/OP-Engineering/link-preview-js
- https://github.com/OP-Engineering/link-preview-js/releases/tag/4.0.4
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N- Debilidad (CWE)
CWE-918- Plataforma
- npm
- Paquete
link-preview-js- Publicada
- 02.09.2026
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-cpjf-6666-r8fx - CC BY 4.0
Historial de vulnerabilidades: link-preview-js
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 3
- Primera → última
- 07.2022 09.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 2
- Media 1
Divulgaciones por año
- 2022: 1
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 2
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link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897 esta entrada
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