{"id":"CVE-2026-61704","aliases":["EUVD-2026-63439","GHSA-cpjf-6666-r8fx"],"status":"published","title":"link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897","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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.0055,"percentile":0.46479,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-918"],"published":"2026-08-20T16:21:10Z","modified":"2026-10-28T02:31:14Z","fixes":[{"ecosystem":"npm","package":"link-preview-js","fixed_in":["4.0.4"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"link-preview-js","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"4.0.3"},{"fixed":"4.0.4"}]}]},{"source":"osv","ecosystem":"npm","package":"link-preview-js","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.0.4"}]}]}],"products":[{"vendor":"op-engineering","product":"link-preview-js"}],"references":[{"url":"https://github.com/OP-Engineering/link-preview-js/security/advisories/GHSA-cpjf-6666-r8fx","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/OP-Engineering/link-preview-js/pull/181","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/OP-Engineering/link-preview-js/commit/6ee25043dd60b097eb70b4ce049aac94b28239e3","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/OP-Engineering/link-preview-js/commit/f3a3dd84adbb9d32d06a933f44ff3eaa837f9a12","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/OP-Engineering/link-preview-js/releases/tag/4.0.4","tags":["x_refsource_MISC","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61704","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-cpjf-6666-r8fx"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61704.json","tags":["advisory"]},{"url":"https://github.com/OP-Engineering/link-preview-js","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-61704","title":"link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897","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.","status":"published","published":"2026-08-20T16:21:10.45Z","modified":"2026-08-25T15:03:17.04Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T14:19:53.4444Z"}],"euvd":[{"id":"EUVD-2026-63439","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.","status":"published","published":"2026-08-20T16:21:10Z","modified":"2026-08-25T15:03:17Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T18:01:32.944243Z"}],"ghsa":[{"id":"GHSA-cpjf-6666-r8fx","title":"link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897","description":"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.","status":"published","published":"2026-09-02T21:29:57Z","modified":"2026-09-02T21:30:53Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T14:41:11.621873Z"}],"nvd":[{"id":"CVE-2026-61704","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.","status":"published","published":"2026-08-20T17:18:51.94Z","modified":"2026-10-18T20:10:00.11Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T14:12:40.302911Z"}],"osv":[{"id":"CVE-2026-61704","title":"link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897","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.","status":"published","published":"2026-08-20T16:21:10.45Z","modified":"2026-10-28T02:31:14.442451648Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T15:45:12.933503Z"},{"id":"GHSA-cpjf-6666-r8fx","title":"link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897","description":"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.","status":"published","published":"2026-09-02T21:29:57Z","modified":"2026-09-02T21:45:09.841015611Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T15:46:45.28161Z"}]}}