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[GHSA-v39h-62p7-jpjc] fast-uri vulnerable to host confusion via percent-encoded authority delimiters #9011

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[GHSA-v39h-62p7-jpjc] fast-uri vulnerable to host confusion via percent-encoded authority delimiters #9011

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26 changes: 24 additions & 2 deletions advisories/github-reviewed/2026/05/GHSA-v39h-62p7-jpjc/GHSA-v39h-62p7-jpjc.json
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{
"schema_version": "1.4.0",
"id": "GHSA-v39h-62p7-jpjc",
"modified": "2026-05-08T19:13:01Z",
"modified": "2026-05-08T19:13:02Z",
"published": "2026-05-08T19:13:01Z",
"aliases": [
"CVE-2026-6322"
],
"summary": "fast-uri vulnerable to host confusion via percent-encoded authority delimiters",
"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://trusted.com@evil.com/`, 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.\n\n### Workarounds\n\nNone. Upgrade to the patched version.",
"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://trusted.com@evil.com/`, 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, `fast-uri` >= 2.4.1\n\n### Workarounds\n\nNone. Upgrade to the patched version.",
"severity": [
{
"type": "CVSS_V3",
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"database_specific": {
"last_known_affected_version_range": "<= 3.1.1"
}
},
{
"package": {
"ecosystem": "npm",
"name": "fast-uri"
},
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.1"
}
]
}
],
"database_specific": {
"last_known_affected_version_range": "<= 2.4.0"
}
}
],
"references": [
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