{"id":"CVE-2026-75899","aliases":["ALSA-2026:71543","CLSA-2026-1784769612","CLSA-2026-1788432470","CLSA-2026-1790604828","CLSA-2026-1790854656","CLSA-2026-1790862941","CLSA-2026-1790876894","CLSA-2026-1792762888","DEBIAN-CVE-2026-75899","EUVD-2026-64763","GHSA-fph4-wmhf-6fwf","RHSA-2026:60855","RHSA-2026:60856","RHSA-2026:60866","RHSA-2026:71543","RHSA-2026:74503","RLSA-2026:71543","ROOT-APP-NPM-CVE-2026-75899","UBUNTU-CVE-2026-75899","openSUSE-SU-2026:12424-1"],"status":"published","title":"fast-uri vulnerable to server-side request forgery via repeated hostname percent-decoding","description":"fast-uri is a URI parser for Node.js. It decodes percent escapes in a hostname during parsing and then decodes the parsed hostname a second time during authority recomposition, so a single call to normalize or resolve can turn nested percent-encoded input into a different network destination such as a loopback hostname or address. For example, a doubly encoded host that spells out a loopback name decodes to that live host in one operation, which contradicts RFC 3986 section 2.4 that an implementation must not decode the same string more than once. An application that normalizes or resolves an untrusted HTTP-family URI before outbound routing, redirect validation, or a host-policy check can receive a destination different from the one the original encoded host represented, giving a server-side request forgery and host-policy bypass primitive. This is an incomplete-fix variant of CVE-2026-6322. The affected versions are 2.4.1 up to but not including 2.4.5, 3.1.2 up to but not including 3.1.6, and 4.0.0 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which normalize percent escapes once and preserve encoded percent signs. 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":"2026-11-09","score":0.0022,"percentile":0.12604,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-174","CWE-918"],"published":"2026-08-04T14:52:48Z","modified":"2026-11-06T17:27:35Z","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":["3.0.6-tuxcare.4"],"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","3.1.2-aikido.3","3.1.5-aikido.2","3.1.2-aikido.4","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","3.1.2-root.io.3","3.1.5-root.io.2","3.1.2-root.io.4","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":"2.4.1"},{"fixed":"2.4.5"}]}]},{"source":"ghsa","ecosystem":"npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.1.2"},{"fixed":"3.1.6"}]}]},{"source":"ghsa","ecosystem":"npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.1.3"}]}]},{"source":"osv","ecosystem":"AlmaLinux:10","package":"cockpit-image-builder","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"94.4-1.el10_2"}]}],"bundled":4},{"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":"3.1.3-tuxcare.0"},{"fixed":"3.1.3-tuxcare.1"}]}],"versions":["3.1.3"],"bundled":2},{"source":"osv","ecosystem":"TuxCare:npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.1.5-tuxcare.0"},{"fixed":"3.1.5-tuxcare.2"}]}],"versions":["3.1.5","3.1.5-tuxcare.1"],"bundled":3},{"source":"osv","ecosystem":"TuxCare:npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.1.2-tuxcare.0"},{"fixed":"3.1.2-tuxcare.2"}]}],"versions":["3.1.2","3.1.2-tuxcare.1"],"bundled":3},{"source":"osv","ecosystem":"TuxCare:npm","package":"fast-uri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.6-tuxcare.0"},{"fixed":"3.0.6-tuxcare.4"}]}],"versions":["3.0.6","3.0.6-tuxcare.1","3.0.6-tuxcare.2","3.0.6-tuxcare.3"]},{"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":"2.4.1"},{"fixed":"2.4.5"}]}]},{"source":"osv","ecosystem":"npm","package":"fast-uri","ranges":[{"type":"SEMVER","events":[{"introduced":"3.1.2"},{"fixed":"3.1.6"}]}]},{"source":"osv","ecosystem":"npm","package":"fast-uri","ranges":[{"type":"SEMVER","events":[{"introduced":"4.0.0"},{"fixed":"4.1.3"}]}]},{"source":"osv","ecosystem":"Red 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https://github.com/andialbrecht/sqlparse/commit/d1d80602741f77ec78e5a04ce4719244cf32352e","tags":["article"]},{"url":"https://github.com/andialbrecht/sqlparse/security/advisories/GHSA-prg7-hcfm-mfcr","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-71491","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2517518","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-71491","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71491","tags":["advisory"]},{"url":"https://github.com/andialbrecht/sqlparse/commit/ef2012a5eeb491e604dea2b00d516904a3830c87","tags":["article"]},{"url":"https://github.com/andialbrecht/sqlparse/security/advisories/GHSA-f2ff-p2ww-7p4p","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-73086","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2514175","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-73086","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73086","tags":["advisory"]},{"url":"https://github.com/ai/nanoid/commit/7087969281cab8ba8ae3babf1894e819068b3bb4","tags":["article"]},{"url":"https://github.com/ai/nanoid/commit/821dfed7b5db7f88e92f56c60eef32c8135077c3","tags":["article"]},{"url":"https://github.com/ai/nanoid/commit/b0036ed60dc9facd7f1191a50dfb3076500202ac","tags":["article"]},{"url":"https://github.com/ai/nanoid/releases/tag/3.3.12","tags":["article"]},{"url":"https://github.com/ai/nanoid/releases/tag/5.1.11","tags":["article"]},{"url":"https://github.com/ai/nanoid/security/advisories/GHSA-xwg4-73v4-xw9w","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-78679","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2523205","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-78679","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-78679","tags":["advisory"]},{"url":"https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-3wxw-xv34-2frg","tags":["article"]},{"url":"https://www.vulncheck.com/advisories/gitpython-before-arbitrary-file-read-via-tagreference-create","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-79654","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2523348","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-79654","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-79654","tags":["advisory"]},{"url":"https://github.com/Katello/katello/pull/11847","tags":["article"]},{"url":"https://projects.theforeman.org/issues/39701","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-84394","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2527756","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-84394","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84394","tags":["advisory"]},{"url":"https://github.com/fastify/fast-uri/security/advisories/GHSA-58mr-gqgx-xq4g","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-87817","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2530744","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-87817","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-87817","tags":["advisory"]},{"url":"https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-239g-whfq-7xj9","tags":["article"]},{"url":"https://www.vulncheck.com/advisories/gitpython-before-3.1.60-remote-code-execution-via-git-directory-impersonation","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-96658","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2534185","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-96658","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96658","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-96659","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536844","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-96659","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96659","tags":["advisory"]},{"url":"https://errata.rockylinux.org/RLSA-2026:71543","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-75899","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-102277","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-110725","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-111181","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-111755","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-111756","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-115754","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-115897","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-116689","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-75899","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-84369","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-86472","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-75899","title":"fast-uri vulnerable to server-side request forgery via repeated hostname percent-decoding","description":"fast-uri is a URI parser for Node.js. It decodes percent escapes in a hostname during parsing and then decodes the parsed hostname a second time during authority recomposition, so a single call to normalize or resolve can turn nested percent-encoded input into a different network destination such as a loopback hostname or address. For example, a doubly encoded host that spells out a loopback name decodes to that live host in one operation, which contradicts RFC 3986 section 2.4 that an implementation must not decode the same string more than once. An application that normalizes or resolves an untrusted HTTP-family URI before outbound routing, redirect validation, or a host-policy check can receive a destination different from the one the original encoded host represented, giving a server-side request forgery and host-policy bypass primitive. This is an incomplete-fix variant of CVE-2026-6322. The affected versions are 2.4.1 up to but not including 2.4.5, 3.1.2 up to but not including 3.1.6, and 4.0.0 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which normalize percent escapes once and preserve encoded percent signs. Users should upgrade to a patched version.","status":"published","published":"2026-08-24T09:40:19.801Z","modified":"2026-08-24T16:19:58.701Z","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-174","CWE-918"],"updated_at":"2026-11-02T14:20:07.260654Z"}],"euvd":[{"id":"EUVD-2026-64763","description":"fast-uri is a URI parser for Node.js. It decodes percent escapes in a hostname during parsing and then decodes the parsed hostname a second time during authority recomposition, so a single call to normalize or resolve can turn nested percent-encoded input into a different network destination such as a loopback hostname or address. For example, a doubly encoded host that spells out a loopback name decodes to that live host in one operation, which contradicts RFC 3986 section 2.4 that an implementation must not decode the same string more than once. An application that normalizes or resolves an untrusted HTTP-family URI before outbound routing, redirect validation, or a host-policy check can receive a destination different from the one the original encoded host represented, giving a server-side request forgery and host-policy bypass primitive. This is an incomplete-fix variant of CVE-2026-6322. The affected versions are 2.4.1 up to but not including 2.4.5, 3.1.2 up to but not including 3.1.6, and 4.0.0 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which normalize percent escapes once and preserve encoded percent signs. Users should upgrade to a patched version.","status":"published","published":"2026-08-24T09:40:19Z","modified":"2026-08-24T16:19:58Z","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-fph4-wmhf-6fwf","title":"fast-uri vulnerable to server-side request forgery via repeated hostname percent-decoding","description":"### Impact\n\n`fast-uri` decodes a hostname's percent escapes twice in a single `normalize()` or `resolve()` call: once during parsing and again during authority recomposition. A nested percent-encoded host therefore survives the first decode and is turned into a live destination by the second, so `normalize('http://%256c%256f%2563%2561%256c%2568%256f%2573%2574/')` returns `http://localhost/`. Applications that normalize or resolve an untrusted URI before an SSRF check, redirect validation, or host allowlist can be steered to a different destination, including internal addresses such as loopback or a cloud metadata endpoint, than the encoded input appeared to contain. This is an incomplete-fix variant of CVE-2026-6322, whose encoded-authority-delimiter fix introduced the second decode.\n\n### Patches\n\nFixed in `fast-uri` 2.4.5, 3.1.6, and 4.1.3.\n\n### Workarounds\n\nReject untrusted URIs whose host component contains an encoded percent sign (`%25`) before passing them to `normalize()` or `resolve()`.","status":"published","published":"2026-09-02T15:42:39Z","modified":"2026-09-02T15:42:41Z","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-174","CWE-918"],"updated_at":"2026-11-02T14:41:11.621873Z"}],"nvd":[{"id":"CVE-2026-75899","description":"fast-uri is a URI parser for Node.js. It decodes percent escapes in a hostname during parsing and then decodes the parsed hostname a second time during authority recomposition, so a single call to normalize or resolve can turn nested percent-encoded input into a different network destination such as a loopback hostname or address. For example, a doubly encoded host that spells out a loopback name decodes to that live host in one operation, which contradicts RFC 3986 section 2.4 that an implementation must not decode the same string more than once. An application that normalizes or resolves an untrusted HTTP-family URI before outbound routing, redirect validation, or a host-policy check can receive a destination different from the one the original encoded host represented, giving a server-side request forgery and host-policy bypass primitive. This is an incomplete-fix variant of CVE-2026-6322. The affected versions are 2.4.1 up to but not including 2.4.5, 3.1.2 up to but not including 3.1.6, and 4.0.0 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which normalize percent escapes once and preserve encoded percent signs. Users should upgrade to a patched version.","status":"published","published":"2026-08-24T10:16:39.96Z","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-174","CWE-918"],"updated_at":"2026-11-02T14:12:41.018848Z"}],"osv":[{"id":"CVE-2026-75899","title":"fast-uri vulnerable to server-side request forgery via repeated hostname percent-decoding","description":"fast-uri is a URI parser for Node.js. It decodes percent escapes in a hostname during parsing and then decodes the parsed hostname a second time during authority recomposition, so a single call to normalize or resolve can turn nested percent-encoded input into a different network destination such as a loopback hostname or address. For example, a doubly encoded host that spells out a loopback name decodes to that live host in one operation, which contradicts RFC 3986 section 2.4 that an implementation must not decode the same string more than once. An application that normalizes or resolves an untrusted HTTP-family URI before outbound routing, redirect validation, or a host-policy check can receive a destination different from the one the original encoded host represented, giving a server-side request forgery and host-policy bypass primitive. This is an incomplete-fix variant of CVE-2026-6322. The affected versions are 2.4.1 up to but not including 2.4.5, 3.1.2 up to but not including 3.1.6, and 4.0.0 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which normalize percent escapes once and preserve encoded percent signs. Users should upgrade to a patched version.","status":"published","published":"2026-08-24T09:40:19.801Z","modified":"2026-11-06T17:27:35.509892641Z","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-174","CWE-918"],"updated_at":"2026-11-06T18:00:32.468734Z"},{"id":"DEBIAN-CVE-2026-75899","description":"fast-uri is a URI parser for Node.js. It decodes percent escapes in a hostname during parsing and then decodes the parsed hostname a second time during authority recomposition, so a single call to normalize or resolve can turn nested percent-encoded input into a different network destination such as a loopback hostname or address. For example, a doubly encoded host that spells out a loopback name decodes to that live host in one operation, which contradicts RFC 3986 section 2.4 that an implementation must not decode the same string more than once. An application that normalizes or resolves an untrusted HTTP-family URI before outbound routing, redirect validation, or a host-policy check can receive a destination different from the one the original encoded host represented, giving a server-side request forgery and host-policy bypass primitive. This is an incomplete-fix variant of CVE-2026-6322. The affected versions are 2.4.1 up to but not including 2.4.5, 3.1.2 up to but not including 3.1.6, and 4.0.0 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which normalize percent escapes once and preserve encoded percent signs. Users should upgrade to a patched version.","status":"published","published":"2026-08-24T10:16:39.96Z","modified":"2026-10-15T10:03:23.039584434Z","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-fph4-wmhf-6fwf","title":"fast-uri vulnerable to server-side request forgery via repeated hostname percent-decoding","description":"### Impact\n\n`fast-uri` decodes a hostname's percent escapes twice in a single `normalize()` or `resolve()` call: once during parsing and again during authority recomposition. A nested percent-encoded host therefore survives the first decode and is turned into a live destination by the second, so `normalize('http://%256c%256f%2563%2561%256c%2568%256f%2573%2574/')` returns `http://localhost/`. Applications that normalize or resolve an untrusted URI before an SSRF check, redirect validation, or host allowlist can be steered to a different destination, including internal addresses such as loopback or a cloud metadata endpoint, than the encoded input appeared to contain. This is an incomplete-fix variant of CVE-2026-6322, whose encoded-authority-delimiter fix introduced the second decode.\n\n### Patches\n\nFixed in `fast-uri` 2.4.5, 3.1.6, and 4.1.3.\n\n### Workarounds\n\nReject untrusted URIs whose host component contains an encoded percent sign (`%25`) before passing them to `normalize()` or `resolve()`.","status":"published","published":"2026-09-02T15:42:39Z","modified":"2026-09-10T03:50:54.420840001Z","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-174","CWE-918"],"updated_at":"2026-11-02T15:46:46.760785Z"},{"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-2026:71543","title":"Red Hat Security Advisory: cockpit-image-builder security update","status":"published","published":"2026-09-25T10:15:29Z","modified":"2026-10-20T10:14:56Z","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":"2026-11-02T15:53:22.928316Z"},{"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":"RLSA-2026:71543","title":"Important: cockpit-image-builder security update","description":"The image-builder-frontend generates custom images suitable for deploying systems or uploading to the cloud. It integrates into Cockpit as a frontend for osbuild.\n\nSecurity Fix(es):\n\n* fast-uri: fast-uri: Server-Side Request Forgery via repeated hostname percent-decoding (CVE-2026-75899)\n\n* fast-uri: fast-uri: Server-side request forgery via malformed IPv6 normalization (CVE-2026-75975)\n\n* fast-uri: fast-uri: URI parsing flaw enables server-side request forgery and redirects (CVE-2026-76172)\n\n* fast-uri: fast-uri: Authority Injection via Unvalidated Port Serialization (CVE-2026-84292)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2026-09-25T12:09:37.504383Z","modified":"2026-09-25T12:30:02.736711368Z","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":"2026-11-02T15:53:26.449929Z"},{"id":"UBUNTU-CVE-2026-75899","description":"fast-uri is a URI parser for Node.js. It decodes percent escapes in a hostname during parsing and then decodes the parsed hostname a second time during authority recomposition, so a single call to normalize or resolve can turn nested percent-encoded input into a different network destination such as a loopback hostname or address. For example, a doubly encoded host that spells out a loopback name decodes to that live host in one operation, which contradicts RFC 3986 section 2.4 that an implementation must not decode the same string more than once. An application that normalizes or resolves an untrusted HTTP-family URI before outbound routing, redirect validation, or a host-policy check can receive a destination different from the one the original encoded host represented, giving a server-side request forgery and host-policy bypass primitive. This is an incomplete-fix variant of CVE-2026-6322. The affected versions are 2.4.1 up to but not including 2.4.5, 3.1.2 up to but not including 3.1.6, and 4.0.0 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which normalize percent escapes once and preserve encoded percent signs. Users should upgrade to a patched version.","status":"published","published":"2026-08-24T10:16:00Z","modified":"2026-10-17T13:01:06.223548617Z","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":"ALSA-2026:71543","title":"Important: cockpit-image-builder security update","description":"The image-builder-frontend generates custom images suitable for deploying systems or uploading to the cloud. It integrates into Cockpit as a frontend for osbuild.  \n\nSecurity Fix(es):  \n\n  * fast-uri: fast-uri: Server-Side Request Forgery via repeated hostname percent-decoding (CVE-2026-75899)\n  * fast-uri: fast-uri: Server-side request forgery via malformed IPv6 normalization (CVE-2026-75975)\n  * fast-uri: fast-uri: URI parsing flaw enables server-side request forgery and redirects (CVE-2026-76172)\n  * fast-uri: fast-uri: Authority Injection via Unvalidated Port Serialization (CVE-2026-84292)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","status":"published","published":"2026-09-24T00:00:00Z","modified":"2026-10-29T11:30:49.617876834Z","updated_at":"2026-11-02T15:27:55.200553Z"},{"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-2026-1790854656","title":"TuxCare security update for fast-uri (2 CVEs)","description":"TuxCare rebuilt fast-uri to address 2 CVEs. Fixed in 3.1.3-tuxcare.1.","status":"published","published":"2026-10-01T11:37:36Z","modified":"2026-10-15T09:47:41.93152624Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"CLSA-2026-1790862941","title":"TuxCare security update for fast-uri (3 CVEs)","description":"TuxCare rebuilt fast-uri to address 3 CVEs. Fixed in 3.1.5-tuxcare.2.","status":"published","published":"2026-10-01T13:55:40Z","modified":"2026-10-15T09:47:59.91732379Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"CLSA-2026-1790876894","title":"TuxCare security update for fast-uri (3 CVEs)","description":"TuxCare rebuilt fast-uri to address 3 CVEs. Fixed in 3.1.2-tuxcare.2.","status":"published","published":"2026-10-01T17:48:14Z","modified":"2026-10-15T09:48:04.328063614Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"CLSA-2026-1792762888","title":"TuxCare security update for fast-uri (1 CVE)","description":"TuxCare rebuilt fast-uri to address 1 CVE. Fixed in 3.0.6-tuxcare.4.","status":"published","published":"2026-10-23T13:41:28Z","modified":"2026-10-23T19:15:08.388136071Z","updated_at":"2026-11-02T15:43:54.981307Z"},{"id":"openSUSE-SU-2026:12424-1","title":"agama-web-ui-25+475.275dd4727-56.1 on GA media","description":"These are all security issues fixed in the agama-web-ui-25+475.275dd4727-56.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-11-05T00:00:00Z","modified":"2026-11-06T17:23:11.345171291Z","updated_at":"2026-11-06T18:05:03.243497Z"},{"id":"ROOT-APP-NPM-CVE-2026-75899","title":"CVE-2026-75899 in fast-uri - Patched by Root","description":"Root has patched CVE-2026-75899 in the fast-uri package for Root:npm. Multiple fixed versions available.","status":"published","published":"2026-10-06T15:34:12Z","modified":"2026-10-06T16:15:04.101274068Z","updated_at":"2026-11-02T15:53:27.649662Z"}]}}