{
    "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"
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            "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",
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                            "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": [
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                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ]
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            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-436",
                            "lang": "en",
                            "description": "CWE-436: Interpretation Conflict",
                            "type": "CWE"
                        }
                    ]
                }
            ],
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}