{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-84394", "assignerOrgId": "ce714d77-add3-4f53-aff5-83d477b104bb", "state": "PUBLISHED", "assignerShortName": "openjs", "dateReserved": "2026-09-01T16:42:27.072Z", "datePublished": "2026-09-02T20:25:35.399Z", "dateUpdated": "2026-09-02T20:25:35.399Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "ce714d77-add3-4f53-aff5-83d477b104bb", "shortName": "openjs", "dateUpdated": "2026-09-02T20:25:35.399Z"}, "descriptions": [{"lang": "en", "value": "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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "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."}]}], "affected": [{"vendor": "fast-uri", "product": "fast-uri", "defaultStatus": "unaffected", "versions": [{"versionType": "semver", "status": "affected", "version": "2.4.5", "lessThan": "2.4.6"}, {"versionType": "semver", "status": "unaffected", "version": "2.4.6"}, {"versionType": "semver", "status": "affected", "version": "3.1.6", "lessThan": "3.1.7"}, {"versionType": "semver", "status": "unaffected", "version": "3.1.7"}, {"versionType": "semver", "status": "affected", "version": "4.1.3", "lessThan": "4.1.4"}, {"versionType": "semver", "status": "unaffected", "version": "4.1.4"}], "packageURL": "pkg:npm/fast-uri"}], "references": [{"url": "https://github.com/fastify/fast-uri/security/advisories/GHSA-58mr-gqgx-xq4g"}, {"url": "https://cna.openjsf.org/security-advisories.html"}], "credits": [{"lang": "en", "type": "reporter", "value": "YashvantHange"}, {"lang": "en", "type": "remediation developer", "value": "mcollina"}, {"lang": "en", "type": "remediation reviewer", "value": "UlisesGascon"}], "title": "fast-uri vulnerable to host confusion via an unclosed bracket in the URI authority", "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-436", "lang": "en", "description": "CWE-436: Interpretation Conflict", "type": "CWE"}]}], "x_generator": {"engine": "cve-kit 1.0.0"}}}}

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