{
"id": "GHSA-v39h-62p7-jpjc",
"aliases": [
"CVE-2026-6322"
],
"details": "### Impact\n\n`fast-uri` v3.1.1 and earlier decodes percent-encoded authority delimiters (`%40` as `@`, `%3A` as `:`) inside the host component and serializes them back as raw characters. This changes the URI structure, turning a hostname into userinfo plus a different host.\n\nFor example, `http://trusted.com%40evil.com/` normalizes to `http://[email protected] /`, which reparses as host `evil.com` with userinfo `trusted.com`.\n\nApplications that normalize untrusted URLs before host allowlist checks, redirect validation, or outbound request routing can be steered to a different authority than the original URL appeared to contain.\n\n### Patches\n\nUpgrade to `fast-uri` >= 3.1.2, or if you are in the v2.x release line, v2.4.1\n\n### Workarounds\n\nNone. Upgrade to the patched version.",
"summary": "fast-uri vulnerable to host confusion via percent-encoded authority delimiters",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "3.0.0"
},
{
"fixed": "3.1.2"
}
]
}
],
"package": {
"name": "fast-uri",
"ecosystem": "npm"
},
"database_specific": {
"last_known_affected_version_range": "<= 3.1.1"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.1"
}
]
}
],
"package": {
"name": "fast-uri",
"ecosystem": "npm"
},
"database_specific": {
"last_known_affected_version_range": "<= 2.4.0"
}
}
],
"modified": "2026-09-01T15:30:39Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
}
],
"published": "2026-05-08T19:13:01Z",
"references": [
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"url": "https://github.com/fastify/fast-uri/security/advisories/GHSA-v39h-62p7-jpjc",
"type": "WEB"
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{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6322",
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"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-140",
"CWE-436"
],
"severity": "HIGH",
"github_reviewed": true,
"nvd_published_at": "2026-05-05T11:16:33Z",
"github_reviewed_at": "2026-05-08T19:13:01Z"
}
}