{"id":"EUVD-2026-78395","revision":null,"records":[{"revision":"a5d57133702b4884a2ce8d872266832f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-86472","aliases":[],"title":"fast-uri vulnerable to inconsistent host case normalization via percent-encoded octets","description":"fast-uri is a dependency-free RFC 3986 URI parser for Node.js, used by Fastify and ajv. In versions before 2.4.7, from 3.0.0 through 3.1.7, and from 4.0.0 through 4.1.4, fast-uri folds the host to lowercase before it percent-decodes the host, so a percent-encoded uppercase octet such as %41 decodes to a literal A that is never folded. For a scheme-relative reference such as //host there is no scheme, so the host canonicalization that would normally repair this does not run, and parse, normalize, and equal then disagree on the same host. An application that makes a case-sensitive host decision on fast-uri output, for example a host allowlist or denylist that compares the parsed host or uses equal, can be steered past the check with a percent-encoded uppercase octet, and because hostnames are case-insensitive in DNS and HTTP the evading spelling still reaches the host the check meant to gate. The issue is fixed in fast-uri 2.4.7, 3.1.8, and 4.1.5, and users should upgrade to one of those versions or later. As a workaround, compare hosts case-insensitively by lowercasing the parsed host before any allowlist or denylist decision.","state":0,"publishedAt":"2026-09-15T10:29:50.594+00:00","modifiedAt":"2026-09-15T12:35:44.789+00:00","affected":[{"ecosystem":"Vendor product","name":"fast-uri","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"fast-uri\",\n                    \"product\": \"fast-uri\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"versionType\": \"semver\",\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.4.7\"\n                        },\n                        {\n                            \"versionType\": \"semver\",\n                            \"status\": \"unaffected\",\n                            \"version\": \"2.4.7\"\n                        },\n                        {\n                            \"versionType\": \"semver\",\n                            \"status\": \"affected\",\n                            \"version\": \"3.0.0\",\n                            \"lessThan\": \"3.1.8\"\n                        },\n                        {\n                            \"versionType\": \"semver\",\n                            \"status\": \"unaffected\",\n                            \"version\": \"3.1.8\"\n                        },\n                        {\n                            \"versionType\": \"semver\",\n                            \"status\": \"affected\",\n                            \"version\": \"4.0.0\",\n                            \"lessThan\": \"4.1.5\"\n                        },\n                        {\n                            \"versionType\": \"semver\",\n                            \"status\": \"unaffected\",\n                            \"version\": \"4.1.5\"\n                        }\n                    ],\n                    \"packageURL\": \"pkg:npm/fast-uri\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","score":4.8,"severity":"MEDIUM"}],"references":["https://github.com/fastify/fast-uri/security/advisories/GHSA-hrr3-gc8f-f4qj","https://cna.openjsf.org/security-advisories.html"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-86472","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-86472","identifiers":["CVE-2026-86472"]},"retained":false,"historicalAffected":[]},{"revision":"4be3450f28d44cf8935dfff8427e658e","observedAt":"2026-11-11T17:02:39.377+00:00","statement":{"source":"euvd","id":"EUVD-2026-78395","aliases":["CVE-2026-86472","GHSA-hrr3-gc8f-f4qj"],"title":"fast-uri is a dependency-free RFC 3986 URI parser for Node.js, used by Fastify and ajv. In versions before 2.4.7, from 3.0.0 through 3.1.7, and from 4.0.0 through 4.1.4, fast-uri folds the host to lowercase before it percent-decodes the hos…","description":"fast-uri is a dependency-free RFC 3986 URI parser for Node.js, used by Fastify and ajv. In versions before 2.4.7, from 3.0.0 through 3.1.7, and from 4.0.0 through 4.1.4, fast-uri folds the host to lowercase before it percent-decodes the host, so a percent-encoded uppercase octet such as %41 decodes to a literal A that is never folded. For a scheme-relative reference such as //host there is no scheme, so the host canonicalization that would normally repair this does not run, and parse, normalize, and equal then disagree on the same host. An application that makes a case-sensitive host decision on fast-uri output, for example a host allowlist or denylist that compares the parsed host or uses equal, can be steered past the check with a percent-encoded uppercase octet, and because hostnames are case-insensitive in DNS and HTTP the evading spelling still reaches the host the check meant to gate. The issue is fixed in fast-uri 2.4.7, 3.1.8, and 4.1.5, and users should upgrade to one of those versions or later. As a workaround, compare hosts case-insensitively by lowercasing the parsed host before any allowlist or denylist decision.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","score":4.8,"severity":null}],"references":["https://github.com/fastify/fast-uri/security/advisories/GHSA-hrr3-gc8f-f4qj","https://cna.openjsf.org/security-advisories.html"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-78395","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 15, 2026, 10:29:50 AM","dateUpdated":"Sep 15, 2026, 12:35:44 PM"},"relatedAdvisories":[{"id":"RHSA-2026:68143","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","vulnerabilityIds":["CVE-2026-9029","CVE-2026-10601","CVE-2026-86472"]},{"id":"RHSA-2026:71040","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","vulnerabilityIds":["CVE-2026-61709","CVE-2026-86472"]},{"id":"RHSA-2026:71906","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","vulnerabilityIds":["CVE-2026-75838","CVE-2026-86472","CVE-2026-93450","CVE-2026-93981"]},{"id":"openSUSE-SU-2026:12424-1","title":"agama-web-ui-25+475.275dd4727-56.1 on GA media","vulnerabilityIds":["CVE-2026-102277","CVE-2026-110725","CVE-2026-111181","CVE-2026-111755","CVE-2026-111756","CVE-2026-115754","CVE-2026-115897","CVE-2026-116689","CVE-2026-75899","CVE-2026-84369","CVE-2026-86472"]}],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-78395","identifiers":["EUVD-2026-78395","CVE-2026-86472","GHSA-hrr3-gc8f-f4qj"]},"retained":false,"historicalAffected":[]},{"revision":"f207ec512881435ab37cea89eaa70e10","observedAt":"2026-10-25T16:19:16.24+00:00","statement":{"source":"nvd","id":"CVE-2026-86472","aliases":[],"title":"fast-uri is a dependency-free RFC 3986 URI parser for Node.js, used by Fastify and ajv. In versions before 2.4.7, from 3.0.0 through 3.1.7, and from 4.0.0 through 4.1.4, fast-uri folds the host to lowercase before it percent-decodes the hos…","description":"fast-uri is a dependency-free RFC 3986 URI parser for Node.js, used by Fastify and ajv. In versions before 2.4.7, from 3.0.0 through 3.1.7, and from 4.0.0 through 4.1.4, fast-uri folds the host to lowercase before it percent-decodes the host, so a percent-encoded uppercase octet such as %41 decodes to a literal A that is never folded. For a scheme-relative reference such as //host there is no scheme, so the host canonicalization that would normally repair this does not run, and parse, normalize, and equal then disagree on the same host. An application that makes a case-sensitive host decision on fast-uri output, for example a host allowlist or denylist that compares the parsed host or uses equal, can be steered past the check with a percent-encoded uppercase octet, and because hostnames are case-insensitive in DNS and HTTP the evading spelling still reaches the host the check meant to gate. The issue is fixed in fast-uri 2.4.7, 3.1.8, and 4.1.5, and users should upgrade to one of those versions or later. As a workaround, compare hosts case-insensitively by lowercasing the parsed host before any allowlist or denylist decision.","state":0,"publishedAt":"2026-09-15T11:17:12.327+00:00","modifiedAt":"2026-09-16T19:40:00.317+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · ce714d77-add3-4f53-aff5-83d477b104bb · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","score":4.8,"severity":"MEDIUM"}],"references":["https://cna.openjsf.org/security-advisories.html","https://github.com/fastify/fast-uri/security/advisories/GHSA-hrr3-gc8f-f4qj"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-86472","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-178"],"productCriteria":[],"sourceDates":{"published":"2026-09-15T11:17:12.327","lastModified":"2026-09-16T19:40:00.317"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-86472","identifiers":["CVE-2026-86472"]},"retained":false,"historicalAffected":[]},{"revision":"79d90e388b764549bc14edc80b2fd955","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-hrr3-gc8f-f4qj","aliases":["CVE-2026-86472"],"title":"fast-uri vulnerable to inconsistent host case normalization via percent-encoded octets","description":"### Impact\n\n`fast-uri` folds the host to lowercase before it percent-decodes the host, so a percent-encoded uppercase unreserved octet such as `%41` decodes to a literal `A` that is never folded. For a scheme-relative reference (`//host`) there is no scheme, so the host canonicalization that repairs this on a scheme-bearing URL does not run. As a result `parse`, `normalize`, and `equal` disagree on the same host: `parse(\"//%41.com\").host` returns `\"A.com\"` while `parse(\"//a.com\").host` and `parse(\"//A.com\").host` return `\"a.com\"`, and `equal(\"//%41.com\", \"//a.com\")` is `false` even though `equal(\"//A.com\", \"//a.com\")` is `true`. An application that makes a case-sensitive host decision on `fast-uri` output for a scheme-relative reference, for example a host allowlist or denylist that compares `parse(url).host` or uses `fast-uri.equal`, can be steered past the check with a percent-encoded uppercase octet. Because a hostname is case-insensitive in DNS and HTTP routing, the evading spelling reaches the same host the check meant to gate, so the effect is check evasion rather than reaching a different registrable host.\n\n### Patches\n\nUpgrade to `fast-uri` 4.1.5, 3.1.8, or 2.4.7.\n\n### Workarounds\n\nCompare hosts case-insensitively (lowercase the parsed host before any allowlist or denylist decision), or avoid making case-sensitive host decisions on scheme-relative input until upgrading.","state":0,"publishedAt":"2026-09-29T23:54:25+00:00","modifiedAt":"2026-09-30T00:00:04.4261655+00:00","affected":[{"ecosystem":"npm","name":"fast-uri","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.4.7"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"fast-uri","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"3.0.0"},{"kind":"fixed","version":"3.1.8"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"fast-uri","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"4.0.0"},{"kind":"fixed","version":"4.1.5"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/fastify/fast-uri/security/advisories/GHSA-hrr3-gc8f-f4qj","https://nvd.nist.gov/vuln/detail/CVE-2026-86472","https://github.com/fastify/fast-uri/commit/5dabb86732aa2a7655e258719970e61e12b6b4d1","https://cna.openjsf.org/security-advisories.html","https://github.com/fastify/fast-uri","https://github.com/fastify/fast-uri/releases/tag/v2.4.7","https://github.com/fastify/fast-uri/releases/tag/v3.1.8","https://github.com/fastify/fast-uri/releases/tag/v4.1.5"],"sourceUrl":"https://github.com/advisories/GHSA-hrr3-gc8f-f4qj","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-hrr3-gc8f-f4qj","identifiers":["GHSA-hrr3-gc8f-f4qj","CVE-2026-86472"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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