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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-53791",
"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"state": "PUBLISHED",
"assignerShortName": "VulnCheck",
"dateReserved": "2026-06-10T20:14:32.827Z",
"datePublished": "2026-08-13T14:38:10.300Z",
"dateUpdated": "2026-08-14T18:09:56.975Z"
},
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"shortName": "VulnCheck",
"dateUpdated": "2026-08-14T16:50:09.199Z"
},
"title": "rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header",
"datePublic": "2026-08-12T00:00:00.000Z",
"problemTypes": [
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"descriptions": [
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"lang": "en",
"cweId": "CWE-290",
"description": "CWE-290 Authentication Bypass by Spoofing",
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"vendor": "RsyncProject",
"product": "rsync",
"repo": "https://github.com/RsyncProject/rsync",
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"status": "affected",
"version": "0",
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"status": "unaffected",
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"lang": "en",
"value": "rsync daemon before 3.5.0 contains an IP address spoofing vulnerability that allows unauthenticated remote attackers to bypass IP-based access controls by sending a crafted PROXY protocol header with a forged source address. Attackers who can connect directly to the rsync daemon can inject a spoofed source IP in the PROXY protocol header to circumvent hosts allow/deny rules, gaining unauthorized access that would otherwise be blocked based on their real source address.",
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"value": "<p>rsync daemon before 3.5.0&nbsp;contains an IP address spoofing vulnerability that allows unauthenticated remote attackers to bypass IP-based access controls by sending a crafted PROXY protocol header with a forged source address. Attackers who can connect directly to the rsync daemon can inject a spoofed source IP in the PROXY protocol header to circumvent hosts allow/deny rules, gaining unauthorized access that would otherwise be blocked based on their real source address.</p>"
}
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"url": "https://github.com/RsyncProject/rsync/security/advisories/GHSA-h2q9-5fr8-w635",
"name": "GitHub Security Advisory (GHSA-h2q9-5fr8-w635)",
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{
"url": "https://github.com/RsyncProject/rsync/releases/tag/v3.5.0",
"name": "rsync 3.5.0 Release Notes",
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{
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"privilegesRequired": "NONE",
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"subConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "HIGH",
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"vulnAvailabilityImpact": "NONE",
"subAvailabilityImpact": "NONE",
"exploitMaturity": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"Automatable": "NOT_DEFINED",
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"integrityImpact": "HIGH",
"availabilityImpact": "NONE",
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"timestamp": "2026-08-14T18:02:57.002288Z",
"id": "CVE-2026-53791",
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