{"id":"CVE-2026-84394","aliases":["CLSA-2026-1790673423","CLSA-2026-1790673455","CLSA-2026-1790676816","CLSA-2026-1790676824","CLSA-2026-1790763862","CLSA-2026-1790765563","CLSA-2026-1791833600","DEBIAN-CVE-2026-84394","EUVD-2026-70282","GHSA-58mr-gqgx-xq4g","RHSA-2026:63782","RHSA-2026:65537","RHSA-2026:65617","RHSA-2026:74503","ROOT-APP-NPM-CVE-2026-84394","UBUNTU-CVE-2026-84394"],"status":"published","title":"fast-uri vulnerable to host confusion via an unclosed bracket in the URI authority","description":"fast-uri accepts a host that contains an unbalanced or misplaced authority bracket without reporting an error. A host that starts with an opening bracket but does not end with a closing bracket is neither validated as an IP literal nor canonicalized as a domain name, so parse() returns it as the host with error undefined, while Node's URL and the HTTP clients built on it resolve the same string to a different host. An application that reads the parsed host to make a host decision, such as an SSRF denylist, a redirect allowlist, or proxy routing, and then passes the original URL to an HTTP client evaluates its policy against a string that is not the host the request reaches. The same host is carried through normalize, equal, and resolve. This affects fast-uri versions 2.4.5, 3.1.6, and 4.1.3, and is fixed in 2.4.6, 3.1.7, and 4.1.4, where parse() reports a malformed host for any host that contains a bracket but is not a valid IPv6 literal.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.0038,"percentile":0.32305,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-436"],"published":"2026-09-02T20:25:35Z","modified":"2026-10-28T02:31:03Z","fixes":[{"ecosystem":"npm","package":"fast-uri","fixed_in":["2.4.6","3.1.7","4.1.4"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:14","package":"node-ajv","fixed_in":["8.20.0~ds+~cs7.1.5-1"],"sources":["osv"]},{"ecosystem":"Root:npm","package":"fast-uri","fixed_in":["4.1.3-aikido.1","4.1.3-aikido.2","3.1.6-aikido.1"],"sources":["osv"]},{"ecosystem":"Root:npm","package":"@rootio/fast-uri","fixed_in":["4.1.3-root.io.1","4.1.3-root.io.2","3.1.6-root.io.1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.4.5"},{"last_affected":"2.4.5"},{"fixed":"2.4.6"}]}],"versions":["2.4.5"]},{"source":"ghsa","ecosystem":"npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.1.6"},{"last_affected":"3.1.6"},{"fixed":"3.1.7"}]}],"versions":["3.1.6"]},{"source":"ghsa","ecosystem":"npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.1.3"},{"last_affected":"4.1.3"},{"fixed":"4.1.4"}]}],"versions":["4.1.3"]},{"source":"osv","ecosystem":"TuxCare:npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.1.4-tuxcare.0"},{"fixed":"3.1.4-tuxcare.2"}]}],"versions":["3.1.4","3.1.4-tuxcare.1"],"bundled":2},{"source":"osv","ecosystem":"TuxCare:npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.4.5-tuxcare.0"},{"fixed":"2.4.5-tuxcare.2"}]}],"versions":["2.4.5","2.4.5-tuxcare.1"],"bundled":2},{"source":"osv","ecosystem":"TuxCare:npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.3-tuxcare.0"},{"fixed":"3.0.3-tuxcare.4"}]}],"versions":["3.0.3","3.0.3-tuxcare.1","3.0.3-tuxcare.2","3.0.3-tuxcare.3"],"bundled":2},{"source":"osv","ecosystem":"TuxCare:npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.4.3-tuxcare.0"},{"fixed":"2.4.3-tuxcare.3"}]}],"versions":["2.4.3","2.4.3-tuxcare.1","2.4.3-tuxcare.2"],"bundled":2},{"source":"osv","ecosystem":"TuxCare:npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.4.2-tuxcare.0"},{"fixed":"2.4.2-tuxcare.3"}]}],"versions":["2.4.2","2.4.2-tuxcare.1","2.4.2-tuxcare.2"],"bundled":2},{"source":"osv","ecosystem":"TuxCare:npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.1-tuxcare.0"},{"fixed":"3.0.1-tuxcare.5"}]}],"versions":["3.0.1","3.0.1-tuxcare.1","3.0.1-tuxcare.2","3.0.1-tuxcare.3","3.0.1-tuxcare.4"],"bundled":2},{"source":"osv","ecosystem":"TuxCare:npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.1.6-tuxcare.0"},{"fixed":"3.1.6-tuxcare.2"}]}],"versions":["3.1.6","3.1.6-tuxcare.1"],"bundled":2},{"source":"osv","ecosystem":"Debian:13","package":"node-ajv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.12.0~ds+~2.1.1-5","8.17.1~ds+~3.0.1+~3.1.0-1","8.17.1~ds+~3.0.1+~3.1.0-2","8.17.1~ds+~3.0.1+~3.1.0-3","8.17.1~ds+~3.0.1+~3.1.0-4","8.18.0~ds+~cs6.1.1-1","8.18.0~ds+~cs6.1.1-2","8.20.0~ds+~cs6.1.3-1","8.20.0~ds+~cs7.1.2-1","8.20.0~ds+~cs7.1.3-1","8.20.0~ds+~cs7.1.3-2","8.20.0~ds+~cs7.1.3-3","8.20.0~ds+~cs7.1.4-1","8.20.0~ds+~cs7.1.5-1","8.20.0~ds+~cs7.1.6-1"]},{"source":"osv","ecosystem":"Debian:14","package":"node-ajv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.20.0~ds+~cs7.1.5-1"}]}],"versions":["8.12.0~ds+~2.1.1-5","8.17.1~ds+~3.0.1+~3.1.0-1","8.17.1~ds+~3.0.1+~3.1.0-2","8.17.1~ds+~3.0.1+~3.1.0-3","8.17.1~ds+~3.0.1+~3.1.0-4","8.18.0~ds+~cs6.1.1-1","8.18.0~ds+~cs6.1.1-2","8.20.0~ds+~cs6.1.3-1","8.20.0~ds+~cs7.1.2-1","8.20.0~ds+~cs7.1.3-1","8.20.0~ds+~cs7.1.3-2","8.20.0~ds+~cs7.1.3-3","8.20.0~ds+~cs7.1.4-1"]},{"source":"osv","ecosystem":"npm","package":"fast-uri","ranges":[{"type":"SEMVER","events":[{"introduced":"2.4.5"},{"fixed":"2.4.6"}]}],"versions":["2.4.5"]},{"source":"osv","ecosystem":"npm","package":"fast-uri","ranges":[{"type":"SEMVER","events":[{"introduced":"3.1.6"},{"fixed":"3.1.7"}]}],"versions":["3.1.6"]},{"source":"osv","ecosystem":"npm","package":"fast-uri","ranges":[{"type":"SEMVER","events":[{"introduced":"4.1.3"},{"fixed":"4.1.4"}]}],"versions":["4.1.3"]},{"source":"osv","ecosystem":"Red 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vulnerable to host confusion via an unclosed bracket in the URI authority","description":"fast-uri accepts a host that contains an unbalanced or misplaced authority bracket without reporting an error. A host that starts with an opening bracket but does not end with a closing bracket is neither validated as an IP literal nor canonicalized as a domain name, so parse() returns it as the host with error undefined, while Node's URL and the HTTP clients built on it resolve the same string to a different host. An application that reads the parsed host to make a host decision, such as an SSRF denylist, a redirect allowlist, or proxy routing, and then passes the original URL to an HTTP client evaluates its policy against a string that is not the host the request reaches. The same host is carried through normalize, equal, and resolve. This affects fast-uri versions 2.4.5, 3.1.6, and 4.1.3, and is fixed in 2.4.6, 3.1.7, and 4.1.4, where parse() reports a malformed host for any host that contains a bracket but is not a valid IPv6 literal.","status":"published","published":"2026-09-02T20:25:35.399Z","modified":"2026-09-03T13:14:42.123Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T14:20:08.734143Z"}],"euvd":[{"id":"EUVD-2026-70282","description":"fast-uri accepts a host that contains an unbalanced or misplaced authority bracket without reporting an error. A host that starts with an opening bracket but does not end with a closing bracket is neither validated as an IP literal nor canonicalized as a domain name, so parse() returns it as the host with error undefined, while Node's URL and the HTTP clients built on it resolve the same string to a different host. An application that reads the parsed host to make a host decision, such as an SSRF denylist, a redirect allowlist, or proxy routing, and then passes the original URL to an HTTP client evaluates its policy against a string that is not the host the request reaches. The same host is carried through normalize, equal, and resolve. This affects fast-uri versions 2.4.5, 3.1.6, and 4.1.3, and is fixed in 2.4.6, 3.1.7, and 4.1.4, where parse() reports a malformed host for any host that contains a bracket but is not a valid IPv6 literal.","status":"published","published":"2026-09-02T20:25:35Z","modified":"2026-09-03T13:14:42Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T18:01:14.198061Z"}],"ghsa":[{"id":"GHSA-58mr-gqgx-xq4g","title":"fast-uri vulnerable to host confusion via an unclosed bracket in the URI authority","description":"### Impact\n\n`fast-uri` accepts a host that contains an unbalanced or misplaced authority bracket (`[` or `]`) without reporting an error. A host that starts with `[` but does not end with `]`, such as `[@127.0.0.1`, is neither validated as an IP literal nor canonicalized as a domain name, so `parse()` returns it as the host with `error` undefined, while Node's `URL` (and `http.get`, `axios`, `got`, and other clients built on it) resolve the same string to `127.0.0.1`. An application that reads `parse().host` to make a host decision (an SSRF denylist, a redirect allowlist, or proxy routing) and then passes the original URL to an HTTP client evaluates its policy against a string that is not the host the request reaches. The same host is carried through `normalize()`, `equal()`, and `resolve()`.\n\n### Patches\n\nThis vulnerability has been patched in fast-uri `4.1.4`, `3.1.7`, and `2.4.6`. `parse()` now reports `URI host is malformed.` for any host that contains a bracket but is not a valid `[IPv6]` literal. All users should upgrade.\n\n### Workarounds\n\nIf upgrading is not immediately possible, reject any URL whose host contains a `[` or `]` that is not a well-formed IPv6 literal before making a host decision. Clients that fail closed on credential-bearing URLs, such as Node's global `fetch()`, are not affected by the reported vector.","status":"published","published":"2026-09-28T21:23:35Z","modified":"2026-09-28T21:23:36Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T14:41:22.654187Z"}],"nvd":[{"id":"CVE-2026-84394","description":"fast-uri accepts a host that contains an unbalanced or misplaced authority bracket without reporting an error. A host that starts with an opening bracket but does not end with a closing bracket is neither validated as an IP literal nor canonicalized as a domain name, so parse() returns it as the host with error undefined, while Node's URL and the HTTP clients built on it resolve the same string to a different host. An application that reads the parsed host to make a host decision, such as an SSRF denylist, a redirect allowlist, or proxy routing, and then passes the original URL to an HTTP client evaluates its policy against a string that is not the host the request reaches. The same host is carried through normalize, equal, and resolve. This affects fast-uri versions 2.4.5, 3.1.6, and 4.1.3, and is fixed in 2.4.6, 3.1.7, and 4.1.4, where parse() reports a malformed host for any host that contains a bracket but is not a valid IPv6 literal.","status":"published","published":"2026-09-03T05:16:38.68Z","modified":"2026-09-04T16:12:20.97Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T14:12:43.399612Z"}],"osv":[{"id":"CVE-2026-84394","title":"fast-uri vulnerable to host confusion via an unclosed bracket in the URI authority","description":"fast-uri accepts a host that contains an unbalanced or misplaced authority bracket without reporting an error. A host that starts with an opening bracket but does not end with a closing bracket is neither validated as an IP literal nor canonicalized as a domain name, so parse() returns it as the host with error undefined, while Node's URL and the HTTP clients built on it resolve the same string to a different host. An application that reads the parsed host to make a host decision, such as an SSRF denylist, a redirect allowlist, or proxy routing, and then passes the original URL to an HTTP client evaluates its policy against a string that is not the host the request reaches. The same host is carried through normalize, equal, and resolve. This affects fast-uri versions 2.4.5, 3.1.6, and 4.1.3, and is fixed in 2.4.6, 3.1.7, and 4.1.4, where parse() reports a malformed host for any host that contains a bracket but is not a valid IPv6 literal.","status":"published","published":"2026-09-02T20:25:35.399Z","modified":"2026-10-28T02:31:03.96675387Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T15:45:18.482949Z"},{"id":"DEBIAN-CVE-2026-84394","description":"fast-uri accepts a host that contains an unbalanced or misplaced authority bracket without reporting an error. A host that starts with an opening bracket but does not end with a closing bracket is neither validated as an IP literal nor canonicalized as a domain name, so parse() returns it as the host with error undefined, while Node's URL and the HTTP clients built on it resolve the same string to a different host. An application that reads the parsed host to make a host decision, such as an SSRF denylist, a redirect allowlist, or proxy routing, and then passes the original URL to an HTTP client evaluates its policy against a string that is not the host the request reaches. The same host is carried through normalize, equal, and resolve. This affects fast-uri versions 2.4.5, 3.1.6, and 4.1.3, and is fixed in 2.4.6, 3.1.7, and 4.1.4, where parse() reports a malformed host for any host that contains a bracket but is not a valid IPv6 literal.","status":"published","published":"2026-09-03T05:16:38.68Z","modified":"2026-10-01T03:03:51.150938903Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:46:04.577397Z"},{"id":"GHSA-58mr-gqgx-xq4g","title":"fast-uri vulnerable to host confusion via an unclosed bracket in the URI authority","description":"### Impact\n\n`fast-uri` accepts a host that contains an unbalanced or misplaced authority bracket (`[` or `]`) without reporting an error. A host that starts with `[` but does not end with `]`, such as `[@127.0.0.1`, is neither validated as an IP literal nor canonicalized as a domain name, so `parse()` returns it as the host with `error` undefined, while Node's `URL` (and `http.get`, `axios`, `got`, and other clients built on it) resolve the same string to `127.0.0.1`. An application that reads `parse().host` to make a host decision (an SSRF denylist, a redirect allowlist, or proxy routing) and then passes the original URL to an HTTP client evaluates its policy against a string that is not the host the request reaches. The same host is carried through `normalize()`, `equal()`, and `resolve()`.\n\n### Patches\n\nThis vulnerability has been patched in fast-uri `4.1.4`, `3.1.7`, and `2.4.6`. `parse()` now reports `URI host is malformed.` for any host that contains a bracket but is not a valid `[IPv6]` literal. All users should upgrade.\n\n### Workarounds\n\nIf upgrading is not immediately possible, reject any URL whose host contains a `[` or `]` that is not a well-formed IPv6 literal before making a host decision. Clients that fail closed on credential-bearing URLs, such as Node's global `fetch()`, are not affected by the reported vector.","status":"published","published":"2026-09-28T21:23:35Z","modified":"2026-09-28T21:30:05.360758321Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T15:46:38.213481Z"},{"id":"RHSA-2026:63782","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","status":"published","published":"2026-09-07T10:18:29Z","modified":"2026-10-20T10:13:02Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:21.91255Z"},{"id":"RHSA-2026:65537","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","status":"published","published":"2026-09-09T10:20:36Z","modified":"2026-10-20T10:43:37.846641597Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:22.406388Z"},{"id":"RHSA-2026:65617","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","status":"published","published":"2026-09-09T10:20:39Z","modified":"2026-10-20T10:13:12Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:22.406388Z"},{"id":"RHSA-2026:74503","title":"Red Hat Security Advisory: Satellite 6.19.5 Async Update","status":"published","published":"2026-10-02T10:25:57Z","modified":"2026-10-20T10:15:35Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L","level":"critical"}],"updated_at":"2026-11-02T15:53:22.928316Z"},{"id":"UBUNTU-CVE-2026-84394","description":"fast-uri accepts a host that contains an unbalanced or misplaced authority bracket without reporting an error. A host that starts with an opening bracket but does not end with a closing bracket is neither validated as an IP literal nor canonicalized as a domain name, so parse() returns it as the host with error undefined, while Node's URL and the HTTP clients built on it resolve the same string to a different host. An application that reads the parsed host to make a host decision, such as an SSRF denylist, a redirect allowlist, or proxy routing, and then passes the original URL to an HTTP client evaluates its policy against a string that is not the host the request reaches. The same host is carried through normalize, equal, and resolve. This affects fast-uri versions 2.4.5, 3.1.6, and 4.1.3, and is fixed in 2.4.6, 3.1.7, and 4.1.4, where parse() reports a malformed host for any host that contains a bracket but is not a valid IPv6 literal.","status":"published","published":"2026-09-03T05:16:00Z","modified":"2026-10-17T13:01:12.701574343Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T16:57:22.213888Z"},{"id":"CLSA-2026-1790673423","title":"TuxCare security update for fast-uri (2 CVEs)","description":"TuxCare rebuilt fast-uri to address 2 CVEs. Fixed in 3.1.4-tuxcare.2.","status":"published","published":"2026-09-29T09:17:03Z","modified":"2026-10-15T09:47:38.385358641Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"CLSA-2026-1790673455","title":"TuxCare security update for fast-uri (2 CVEs)","description":"TuxCare rebuilt fast-uri to address 2 CVEs. Fixed in 2.4.5-tuxcare.2.","status":"published","published":"2026-09-29T09:17:35Z","modified":"2026-10-15T09:48:03.990261525Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"CLSA-2026-1790676816","title":"TuxCare security update for fast-uri (2 CVEs)","description":"TuxCare rebuilt fast-uri to address 2 CVEs. Fixed in 3.0.3-tuxcare.4.","status":"published","published":"2026-09-29T10:13:36Z","modified":"2026-10-15T09:47:38.230937949Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"CLSA-2026-1790676824","title":"TuxCare security update for fast-uri (2 CVEs)","description":"TuxCare rebuilt fast-uri to address 2 CVEs. Fixed in 2.4.3-tuxcare.3.","status":"published","published":"2026-09-29T10:13:44Z","modified":"2026-10-15T09:48:03.103544444Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"CLSA-2026-1790763862","title":"TuxCare security update for fast-uri (2 CVEs)","description":"TuxCare rebuilt fast-uri to address 2 CVEs. Fixed in 2.4.2-tuxcare.3.","status":"published","published":"2026-09-30T10:24:22Z","modified":"2026-10-15T09:47:57.306692829Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"CLSA-2026-1790765563","title":"TuxCare security update for fast-uri (2 CVEs)","description":"TuxCare rebuilt fast-uri to address 2 CVEs. Fixed in 3.0.1-tuxcare.5.","status":"published","published":"2026-09-30T10:52:43Z","modified":"2026-10-15T09:47:53.549609592Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"CLSA-2026-1791833600","title":"TuxCare security update for fast-uri (2 CVEs)","description":"TuxCare rebuilt fast-uri to address 2 CVEs. Fixed in 3.1.6-tuxcare.2.","status":"published","published":"2026-10-12T19:33:20Z","modified":"2026-10-15T09:47:47.890379728Z","updated_at":"2026-11-02T15:43:50.599064Z"},{"id":"ROOT-APP-NPM-CVE-2026-84394","title":"CVE-2026-84394 in fast-uri - Patched by Root","description":"Root has patched CVE-2026-84394 in the fast-uri package for Root:npm. Multiple fixed versions available.","status":"published","published":"2026-10-06T09:34:16Z","modified":"2026-10-06T10:15:09.289782891Z","updated_at":"2026-11-02T15:53:27.649662Z"}]}}