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CVE-2026-43897— Link Preview JS: vunerable to IPv6 and internal loopback attacks

Quick assessment

Affected
OP-Engineering link-preview-js
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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是op-engineering开源的一个用于提取网络链接信息的工具。 Link Preview JS 4.0.1之前版本存在代码问题漏洞，该漏洞源于库未检查IPv6回环攻击，且存在DNS攻击导致地址可解析为内部IP，可能造成内部数据泄露。

AI Predicted 5.3 Difficulty: Easy EPSS 0.43% · P36

Affected Version Matrix 1

VendorProduct Version RangeStatus
OP-Engineering link-preview-js < 4.0.1 affected
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I. Basic Information for CVE-2026-43897

Vulnerability Information
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Vulnerability Title
Link Preview JS: vunerable to IPv6 and internal loopback attacks
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Link Preview JS 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Link Preview JS是op-engineering开源的一个用于提取网络链接信息的工具。 Link Preview JS 4.0.1之前版本存在代码问题漏洞，该漏洞源于库未检查IPv6回环攻击，且存在DNS攻击导致地址可解析为内部IP，可能造成内部数据泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OP-Engineering link-preview-js < 4.0.1 -

II. Public POCs for CVE-2026-43897

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III. Intelligence Information for CVE-2026-43897

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Patches & Fixes for CVE-2026-43897 (2)

Vendor Advisories for CVE-2026-43897 (1)

Vendor Pages for CVE-2026-43897 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-43897

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