link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897 (CVE-2026-61704) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-61704

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

Answer in brief

CVE-2026-61704 records a Unknown severity vulnerability in link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897. The current sources do not mark it as known exploited. The current feed maps OP-Engineering/link-preview-js (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 20, 2026Updated Aug 20, 2026Source checked Aug 20, 2026First seen by HOL Aug 20, 2026Material review Aug 20, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps OP-Engineering/link-preview-js (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
OP-Engineering/link-preview-jsgeneric	< 4.0.4	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for OP-Engineering/link-preview-js.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 20, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 20, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 20, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.