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CVE-2026-61704— link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897

Quick assessment

Affected
OP-Engineering link-preview-js
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Link Preview JS 用于提取网页链接信息。在版本 4.0.4 之前，index.ts 中的 resolveDNSHost 缓解机制仅对一个已解析的 IP 地址进行验证，但随后却使用原始主机名发起请求。攻击者可以操控 DNS 服务器，在验证阶段返回一个公网 IP 地址，而在最终连接阶段返回环回地址或内网地址。这种 DNS 重绑定（DNS rebinding）漏洞绕过了 SSRF（服务端请求伪造）防护，导致服务端预览抓取可能访问到内部 HTTP 资源。重定向处理也存在类似的“验证与请求不匹配”的问题。该问题

CVSS 7.5 · High EPSS 0.40% · P34

Affected Version Matrix 1

VendorProduct Version RangeStatus
OP-Engineering link-preview-js < 4.0.4 affected
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I. Basic Information for CVE-2026-61704

Vulnerability Information
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Vulnerability Title
link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OP-Engineering link-preview-js < 4.0.4 -

II. Public POCs for CVE-2026-61704

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9679 chars
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III. Intelligence Information for CVE-2026-61704

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Patches & Fixes for CVE-2026-61704 (3)

Vendor Advisories for CVE-2026-61704 (1)

Vendor Pages for CVE-2026-61704 (1)

IV. Related Vulnerabilities

Same product: link-preview-js
Same vendor: OP-Engineering
Same weakness: CWE-918

V. Comments for CVE-2026-61704

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