{"id":"CVE-2026-75931","aliases":["CLSA-2026-1784769612","CLSA-2026-1788432470","CLSA-2026-1790604828","CLSA-2026-1790854678","CLSA-2026-1790863104","DEBIAN-CVE-2026-75931","EUVD-2026-64758","GHSA-5jgf-p345-68v8","RHSA-2026:60855","RHSA-2026:60856","RHSA-2026:60866","RHSA-2026:74503","ROOT-APP-NPM-CVE-2026-75931","UBUNTU-CVE-2026-75931"],"status":"published","title":"fast-uri vulnerable to host confusion via skipped IDN canonicalization on scheme-relative references","description":"fast-uri is a URI parser for Node.js. It canonicalizes a host to its ASCII form only when the input carries an explicit scheme, so a scheme-relative reference such as a host preceded by two slashes is returned with its host verbatim and no error set. As a result fast-uri's own entry points disagree with each other: parse, resolve, normalize, and equal can yield different hosts for the same input depending only on whether a scheme is written out, and equal can return opposite verdicts for the same pair of hosts. An application that extracts a host with fast-uri to check it against a policy list and then resolves the same reference can make its decision on one host while the destination is another, enabling host confusion and policy bypass. The affected versions are 2.4.2 up to but not including 2.4.5, 3.1.3 up to but not including 3.1.6, and 4.0.1 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which canonicalize the host consistently across the resolve path. Users should upgrade to a patched version.","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":"2026-11-11","score":0.00398,"percentile":0.34479,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-436"],"published":"2026-08-04T14:52:48Z","modified":"2026-11-05T11:15:08Z","fixes":[{"ecosystem":"npm","package":"fast-uri","fixed_in":["2.4.5","3.1.6","4.1.3"],"sources":["ghsa","osv"]},{"ecosystem":"TuxCare:npm","package":"fast-uri","fixed_in":["3.1.5-tuxcare.1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"node-ajv","fixed_in":["8.20.0~ds+~cs7.1.4-1"],"sources":["osv"]},{"ecosystem":"Root:npm","package":"fast-uri","fixed_in":["3.1.5-aikido.1","3.1.5-aikido.2","3.1.3-aikido.3","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":["3.1.5-root.io.1","3.1.5-root.io.2","3.1.3-root.io.3","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":"2.4.2"},{"fixed":"2.4.5"}]}]},{"source":"ghsa","ecosystem":"npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.1.3"},{"fixed":"3.1.6"}]}]},{"source":"ghsa","ecosystem":"npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.1"},{"fixed":"4.1.3"}]}]},{"source":"osv","ecosystem":"TuxCare:npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.4.2-tuxcare.0"},{"fixed":"2.4.2-tuxcare.1"}]}],"versions":["2.4.2"],"bundled":6},{"source":"osv","ecosystem":"TuxCare:npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.4.3-tuxcare.0"},{"fixed":"2.4.3-tuxcare.2"}]}],"versions":["2.4.3","2.4.3-tuxcare.1"],"bundled":4},{"source":"osv","ecosystem":"TuxCare:npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.1.4-tuxcare.0"},{"fixed":"3.1.4-tuxcare.1"}]}],"versions":["3.1.4"],"bundled":5},{"source":"osv","ecosystem":"TuxCare:npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.1.5-tuxcare.0"},{"fixed":"3.1.5-tuxcare.1"}]}],"versions":["3.1.5"]},{"source":"osv","ecosystem":"TuxCare:npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.1.3-tuxcare.0"},{"fixed":"3.1.3-tuxcare.2"}]}],"versions":["3.1.3","3.1.3-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","8.20.0~ds+~cs7.1.6-2"]},{"source":"osv","ecosystem":"Debian:14","package":"node-ajv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.20.0~ds+~cs7.1.4-1"}]}],"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"]},{"source":"osv","ecosystem":"npm","package":"fast-uri","ranges":[{"type":"SEMVER","events":[{"introduced":"2.4.2"},{"fixed":"2.4.5"}]}]},{"source":"osv","ecosystem":"npm","package":"fast-uri","ranges":[{"type":"SEMVER","events":[{"introduced":"3.1.3"},{"fixed":"3.1.6"}]}]},{"source":"osv","ecosystem":"npm","package":"fast-uri","ranges":[{"type":"SEMVER","events":[{"introduced":"4.0.1"},{"fixed":"4.1.3"}]}]},{"source":"osv","ecosystem":"Red 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vulnerable to host confusion via skipped IDN canonicalization on scheme-relative references","description":"fast-uri is a URI parser for Node.js. It canonicalizes a host to its ASCII form only when the input carries an explicit scheme, so a scheme-relative reference such as a host preceded by two slashes is returned with its host verbatim and no error set. As a result fast-uri's own entry points disagree with each other: parse, resolve, normalize, and equal can yield different hosts for the same input depending only on whether a scheme is written out, and equal can return opposite verdicts for the same pair of hosts. An application that extracts a host with fast-uri to check it against a policy list and then resolves the same reference can make its decision on one host while the destination is another, enabling host confusion and policy bypass. The affected versions are 2.4.2 up to but not including 2.4.5, 3.1.3 up to but not including 3.1.6, and 4.0.1 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which canonicalize the host consistently across the resolve path. Users should upgrade to a patched version.","status":"published","published":"2026-08-24T09:30:04.212Z","modified":"2026-08-24T16:28:48.098Z","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":"2026-11-02T14:20:07.260654Z"}],"euvd":[{"id":"EUVD-2026-64758","description":"fast-uri is a URI parser for Node.js. It canonicalizes a host to its ASCII form only when the input carries an explicit scheme, so a scheme-relative reference such as a host preceded by two slashes is returned with its host verbatim and no error set. As a result fast-uri's own entry points disagree with each other: parse, resolve, normalize, and equal can yield different hosts for the same input depending only on whether a scheme is written out, and equal can return opposite verdicts for the same pair of hosts. An application that extracts a host with fast-uri to check it against a policy list and then resolves the same reference can make its decision on one host while the destination is another, enabling host confusion and policy bypass. The affected versions are 2.4.2 up to but not including 2.4.5, 3.1.3 up to but not including 3.1.6, and 4.0.1 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which canonicalize the host consistently across the resolve path. Users should upgrade to a patched version.","status":"published","published":"2026-08-24T09:30:04Z","modified":"2026-08-24T16:28:48Z","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":"2026-11-02T18:01:34.563496Z"}],"ghsa":[{"id":"GHSA-5jgf-p345-68v8","title":"fast-uri vulnerable to host confusion via skipped IDN canonicalization on scheme-relative references","description":"### Impact\n\n`fast-uri` canonicalizes a host to its ASCII form only when the input carries an explicit scheme. When `resolve()` resolves a scheme-relative reference (`//host/`) against a scheme-bearing base, it still emits the host verbatim even though the effective scheme is known, so re-parsing the resolved URI yields a different host than the one `resolve()` returned. An application that resolves an untrusted reference with `fast-uri` and then checks or routes on the resulting host can make a policy decision on one host and reach another. This is an incomplete-fix variant of CVE-2026-13676, whose IDN canonicalization was applied only to the scheme-bearing form.\n\n### Patches\n\nUpgrade to `fast-uri` 2.4.5, 3.1.6, or 4.1.3. `resolve()` now canonicalizes the host once the effective scheme is known, and fails closed if a raw non-ASCII host cannot be converted.\n\n### Workarounds\n\nResolve scheme-relative references against a base that carries a scheme before performing any host-policy or origin check.","status":"published","published":"2026-09-02T15:44:30Z","modified":"2026-09-02T15:44:32Z","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":"2026-11-02T14:41:11.621873Z"}],"nvd":[{"id":"CVE-2026-75931","description":"fast-uri is a URI parser for Node.js. It canonicalizes a host to its ASCII form only when the input carries an explicit scheme, so a scheme-relative reference such as a host preceded by two slashes is returned with its host verbatim and no error set. As a result fast-uri's own entry points disagree with each other: parse, resolve, normalize, and equal can yield different hosts for the same input depending only on whether a scheme is written out, and equal can return opposite verdicts for the same pair of hosts. An application that extracts a host with fast-uri to check it against a policy list and then resolves the same reference can make its decision on one host while the destination is another, enabling host confusion and policy bypass. The affected versions are 2.4.2 up to but not including 2.4.5, 3.1.3 up to but not including 3.1.6, and 4.0.1 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which canonicalize the host consistently across the resolve path. Users should upgrade to a patched version.","status":"published","published":"2026-08-24T10:16:40.113Z","modified":"2026-10-14T13:10:00.187Z","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":"2026-11-02T14:12:41.018848Z"}],"osv":[{"id":"CVE-2026-75931","title":"fast-uri vulnerable to host confusion via skipped IDN canonicalization on scheme-relative references","description":"fast-uri is a URI parser for Node.js. It canonicalizes a host to its ASCII form only when the input carries an explicit scheme, so a scheme-relative reference such as a host preceded by two slashes is returned with its host verbatim and no error set. As a result fast-uri's own entry points disagree with each other: parse, resolve, normalize, and equal can yield different hosts for the same input depending only on whether a scheme is written out, and equal can return opposite verdicts for the same pair of hosts. An application that extracts a host with fast-uri to check it against a policy list and then resolves the same reference can make its decision on one host while the destination is another, enabling host confusion and policy bypass. The affected versions are 2.4.2 up to but not including 2.4.5, 3.1.3 up to but not including 3.1.6, and 4.0.1 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which canonicalize the host consistently across the resolve path. Users should upgrade to a patched version.","status":"published","published":"2026-08-24T09:30:04.212Z","modified":"2026-10-28T02:30:41.576677659Z","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":"2026-11-02T15:45:17.102988Z"},{"id":"DEBIAN-CVE-2026-75931","description":"fast-uri is a URI parser for Node.js. It canonicalizes a host to its ASCII form only when the input carries an explicit scheme, so a scheme-relative reference such as a host preceded by two slashes is returned with its host verbatim and no error set. As a result fast-uri's own entry points disagree with each other: parse, resolve, normalize, and equal can yield different hosts for the same input depending only on whether a scheme is written out, and equal can return opposite verdicts for the same pair of hosts. An application that extracts a host with fast-uri to check it against a policy list and then resolves the same reference can make its decision on one host while the destination is another, enabling host confusion and policy bypass. The affected versions are 2.4.2 up to but not including 2.4.5, 3.1.3 up to but not including 3.1.6, and 4.0.1 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which canonicalize the host consistently across the resolve path. Users should upgrade to a patched version.","status":"published","published":"2026-08-24T10:16:40.113Z","modified":"2026-10-15T10:03:22.582081161Z","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":"2026-11-02T15:46:03.502256Z"},{"id":"GHSA-5jgf-p345-68v8","title":"fast-uri vulnerable to host confusion via skipped IDN canonicalization on scheme-relative references","description":"### Impact\n\n`fast-uri` canonicalizes a host to its ASCII form only when the input carries an explicit scheme. When `resolve()` resolves a scheme-relative reference (`//host/`) against a scheme-bearing base, it still emits the host verbatim even though the effective scheme is known, so re-parsing the resolved URI yields a different host than the one `resolve()` returned. An application that resolves an untrusted reference with `fast-uri` and then checks or routes on the resulting host can make a policy decision on one host and reach another. This is an incomplete-fix variant of CVE-2026-13676, whose IDN canonicalization was applied only to the scheme-bearing form.\n\n### Patches\n\nUpgrade to `fast-uri` 2.4.5, 3.1.6, or 4.1.3. `resolve()` now canonicalizes the host once the effective scheme is known, and fails closed if a raw non-ASCII host cannot be converted.\n\n### Workarounds\n\nResolve scheme-relative references against a base that carries a scheme before performing any host-policy or origin check.","status":"published","published":"2026-09-02T15:44:30Z","modified":"2026-09-10T03:51:15.083681721Z","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":"2026-11-02T15:46:38.553953Z"},{"id":"RHSA-2026:60855","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","status":"published","published":"2026-08-30T10:06:48Z","modified":"2026-10-20T10:12:17Z","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-2026:60856","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","status":"published","published":"2026-08-30T10:06:49Z","modified":"2026-10-20T10:12:18Z","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-2026:60866","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","status":"published","published":"2026-08-30T10:06:50Z","modified":"2026-10-20T10:12:18Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T15:53:21.91255Z"},{"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-2026-75931","description":"fast-uri is a URI parser for Node.js. It canonicalizes a host to its ASCII form only when the input carries an explicit scheme, so a scheme-relative reference such as a host preceded by two slashes is returned with its host verbatim and no error set. As a result fast-uri's own entry points disagree with each other: parse, resolve, normalize, and equal can yield different hosts for the same input depending only on whether a scheme is written out, and equal can return opposite verdicts for the same pair of hosts. An application that extracts a host with fast-uri to check it against a policy list and then resolves the same reference can make its decision on one host while the destination is another, enabling host confusion and policy bypass. The affected versions are 2.4.2 up to but not including 2.4.5, 3.1.3 up to but not including 3.1.6, and 4.0.1 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which canonicalize the host consistently across the resolve path. Users should upgrade to a patched version.","status":"published","published":"2026-08-24T10:16:00Z","modified":"2026-10-17T13:01:06.770502601Z","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":"2026-11-02T16:57:13.483205Z"},{"id":"CLSA-2026-1784769612","title":"TuxCare security update for fast-uri (6 CVEs)","description":"TuxCare rebuilt fast-uri to address 6 CVEs. Fixed in 2.4.2-tuxcare.1.","status":"published","published":"2026-08-04T14:52:48Z","modified":"2026-10-15T09:47:36.429669264Z","updated_at":"2026-11-02T15:43:46.482572Z"},{"id":"CLSA-2026-1788432470","title":"TuxCare security update for fast-uri (4 CVEs)","description":"TuxCare rebuilt fast-uri to address 4 CVEs. Fixed in 2.4.3-tuxcare.2.","status":"published","published":"2026-09-03T10:47:50Z","modified":"2026-10-15T09:48:03.1444326Z","updated_at":"2026-11-02T15:43:47.591214Z"},{"id":"CLSA-2026-1790604828","title":"TuxCare security update for fast-uri (5 CVEs)","description":"TuxCare rebuilt fast-uri to address 5 CVEs. Fixed in 3.1.4-tuxcare.1.","status":"published","published":"2026-09-28T14:13:48Z","modified":"2026-10-15T09:48:03.133317375Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"CLSA-2026-1790854678","title":"TuxCare security update for fast-uri (1 CVE)","description":"TuxCare rebuilt fast-uri to address 1 CVE. Fixed in 3.1.5-tuxcare.1.","status":"published","published":"2026-10-01T11:37:58Z","modified":"2026-10-15T09:47:42.102990793Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"CLSA-2026-1790863104","title":"TuxCare security update for fast-uri (2 CVEs)","description":"TuxCare rebuilt fast-uri to address 2 CVEs. Fixed in 3.1.3-tuxcare.2.","status":"published","published":"2026-10-01T13:58:24Z","modified":"2026-10-15T09:48:04.016731974Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"ROOT-APP-NPM-CVE-2026-75931","title":"CVE-2026-75931 in fast-uri - Patched by Root","description":"Root has patched CVE-2026-75931 in the fast-uri package for Root:npm. Multiple fixed versions available.","status":"published","published":"2026-11-05T10:50:51Z","modified":"2026-11-05T11:15:08.18698637Z","updated_at":"2026-11-05T13:30:49.23793Z"}]}}