CVE-2026-43897Network attack vector

Internal data disclosure via incomplete SSRF validation

Published May 11, 2026 · Updated May 11, 2026

Server-side request forgery in OP Engineering link-preview-js before 4.0.1 allows remote attackers to read internal data via crafted URLs. The getLinkPreview URL validation omits IPv6 loopback and local-range forms and, without resolveDNSHost, fetches hostnames before checking their resolved internal address. An application must pass attacker-controlled URLs to the Node.js fetch path; successful requests can expose internal services or cloud metadata to the caller.

CVSS severity8.7
High
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in OP Engineering link-preview-js before 4.0.1 allows remote attackers to read internal data via crafted URLs. The getLinkPreview URL validation omits IPv6 loopback and local-range forms and, without resolveDNSHost, fetches hostnames before checking their resolved internal address. An application must pass attacker-controlled URLs to the Node.js fetch path; successful requests can expose internal services or cloud metadata to the caller.

The record

CVE
CVE-2026-43897
Published
May 11, 2026
Updated
May 11, 2026
Vendor
OP Engineering
Product
link-preview-js
Classifications
CWE-918
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 11, 2026CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OP Engineering · link-preview-jsversion=< 4.0.1

Published CVSS scores

8.7GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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