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Vulnerability record · CVE-2026-61704 · published 20 August 2026

CVE-2026-61704: Server-side request forgery (SSRF) vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.55% · top 56.2% CWE-918 · Server-side request forgery (SSRF) Deferred
7.5CVSS 3.1 base score
0.55%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
18 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

LinkTags
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/pull/181
https://github.com/OP-Engineering/link-preview-js/releases/tag/4.0.4
https://github.com/OP-Engineering/link-preview-js/security/advisories/GHSA-cpjf-6666-r8fx

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Source: NIST National Vulnerability Database (record CVE-2026-61704), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.