{"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":"The existing advisory GHSA-4gp8-rjrq-ch6q / CVE-2026-43897 states that the SSRF issue was fixed in 4.0.1. However, 4.0.3 remains bypassable when the documented resolveDNSHost mitigation is used.\n\nRoot cause:\nThe library validates one resolved IP address through resolveDNSHost, but later performs fetch() against the original hostname without pinning the connection to the validated IP. An attacker-controlled DNS server can return a public IP during validation and a loopback/internal IP during the final connection.\n\nImpact:\nThis allows an attacker to bypass the documented SSRF mitigation and make the server-side fetch reach loopback or internal addresses under DNS rebinding conditions.\n\nThis appears to be either an incomplete fix for CVE-2026-43897 or a new DNS rebinding SSRF bypass affecting the latest version.\n\nThe PoC was reproduced in a local-only controlled environment to avoid targeting production or third-party systems. Evidence and reproduction details can be provided privately.","published":"2026-08-20T16:21:10.450Z","modified":"2026-09-20T11:31:01.363247613Z","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":[{"ecosystem":"npm","name":"link-preview-js","fixedVersion":"4.0.4"}],"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"},{"type":"PACKAGE","url":"https://github.com/OP-Engineering/link-preview-js"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-20T11:31:01.363247613Z"}}