{"id":"CVE-2026-61704","aliases":["GHSA-cpjf-6666-r8fx"],"url":"https://o3.security/vulnerability/CVE-2026-61704","summary":"link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897","details":"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.","published":"2026-08-20T16:21:10.450Z","modified":"2026-08-22T03:58:08.285426452Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/OP-Engineering/link-preview-js/commit/6ee25043dd60b097eb70b4ce049aac94b28239e3","label":"OP-Engineering/link-preview-js@6ee2504"},"references":[{"type":"WEB","url":"https://github.com/OP-Engineering/link-preview-js/releases/tag/4.0.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61704.json"},{"type":"ADVISORY","url":"https://github.com/OP-Engineering/link-preview-js/security/advisories/GHSA-cpjf-6666-r8fx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61704"},{"type":"FIX","url":"https://github.com/OP-Engineering/link-preview-js/commit/6ee25043dd60b097eb70b4ce049aac94b28239e3"},{"type":"FIX","url":"https://github.com/OP-Engineering/link-preview-js/commit/f3a3dd84adbb9d32d06a933f44ff3eaa837f9a12"},{"type":"FIX","url":"https://github.com/OP-Engineering/link-preview-js/pull/181"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-22T03:58:08.285426452Z"}}