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vuln-cve/data/2026/86xxx/CVE-2026-86205.json
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{
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"cveId": "CVE-2026-86205",
"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"state": "PUBLISHED",
"assignerShortName": "VulnCheck",
"dateReserved": "2026-09-05T11:52:36.822Z",
"datePublished": "2026-09-06T12:00:25.530Z",
"dateUpdated": "2026-09-08T13:28:55.791Z"
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},
"datePublic": "2026-03-21T00:00:00.000Z",
"title": "h3 before 2.0.1-rc.18 Open Redirect via redirectBack()",
"descriptions": [
{
"lang": "en",
"value": "h3 versions before 2.0.1-rc.18 contain an open redirect vulnerability in the redirectBack() utility that fails to sanitize protocol-relative paths in the Referer header pathname. Attackers can craft a same-origin URL with a double-slash path segment that passes origin validation but produces a Location header interpreted by browsers as a protocol-relative redirect to an external domain."
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{
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"type": "CWE"
}
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"vendor": "h3js",
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"version": "2.0.1-rc.17",
"status": "affected",
"lessThan": "2.0.1-rc.18",
"versionType": "semver"
},
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"attackRequirements": "NONE",
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"vulnIntegrityImpact": "LOW",
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"subConfidentialityImpact": "NONE",
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"scope": "UNCHANGED",
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"integrityImpact": "LOW",
"availabilityImpact": "NONE",
"baseScore": 5.4,
"baseSeverity": "MEDIUM"
}
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"references": [
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"url": "https://github.com/h3js/h3/security/advisories/GHSA-fp4x-ggrf-wmc6",
"tags": [
"vendor-advisory"
],
"name": "GitHub Security Advisory (GHSA-fp4x-ggrf-wmc6)"
},
{
"name": "VulnCheck Advisory: h3 before 2.0.1-rc.18 Open Redirect via redirectBack()",
"tags": [
"third-party-advisory"
],
"url": "https://www.vulncheck.com/advisories/h3-before-2.0.1-rc.18-open-redirect-via-redirectback"
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"timestamp": "2026-09-08T13:28:03.688110Z",
"id": "CVE-2026-86205",
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{
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{
"Automatable": "no"
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{
"Technical Impact": "partial"
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"role": "CISA Coordinator",
"version": "2.0.3"
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}