CVE-2026-53786
Full vulnerability record from the local CVENow database.
Description
rsync before 3.5.0 contains a filter rule bypass vulnerability that allows authenticated clients to override module-level filter restrictions by supplying malicious --filter merge file directives. Attackers can inject client-side merge file directives during filter evaluation to introduce rules that supersede daemon module-level restrictions, gaining access to files the module filter was intended to exclude.
Severity
MEDIUM
CVSS score
6.9
(v4.0)
Vulnerability status
Analyzed
Source identifier
Published
2026-08-13 15:19:42.700000
Last modified
2026-10-24 16:10:00.153000
View original CVE JSON
{
"id": "CVE-2026-53786",
"sourceIdentifier": "[email protected]",
"published": "2026-08-13T15:19:42.700",
"lastModified": "2026-10-24T16:10:00.153",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "rsync before 3.5.0 contains a filter rule bypass vulnerability that allows authenticated clients to override module-level filter restrictions by supplying malicious --filter merge file directives. Attackers can inject client-side merge file directives during filter evaluation to introduce rules that supersede daemon module-level restrictions, gaining access to files the module filter was intended to exclude."
},
{
"lang": "es",
"value": "rsync anterior a la versión 3.5.0 contiene una vulnerabilidad de omisión de reglas de filtro que permite a clientes autenticados anular las restricciones de filtro a nivel de módulo al proporcionar directivas de archivo de fusión --filter maliciosas. Los atacantes pueden inyectar directivas de archivo de fusión del lado del cliente durante la evaluación del filtro para introducir reglas que anulen las restricciones a nivel de módulo del demonio, obteniendo acceso a archivos que el filtro del módulo pretendía excluir."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "RsyncProject",
"product": "rsync",
"defaultStatus": "unaffected",
"repo": "https://github.com/RsyncProject/rsync",
"packageURL": "pkg:github/RsyncProject/rsync",
"versions": [
{
"version": "0",
"lessThanOrEqual": "3.4.4",
"versionType": "semver",
"status": "affected"
},
{
"version": "3.5.0",
"versionType": "semver",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV40": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "4.0",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"baseScore": 6.9,
"baseSeverity": "MEDIUM",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "LOW",
"vulnAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"subAvailabilityImpact": "NONE",
"exploitMaturity": "NOT_DEFINED",
"confidentialityRequirement": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"availabilityRequirement": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"valueDensity": "NOT_DEFINED",
"vulnerabilityResponseEffort": "NOT_DEFINED",
"providerUrgency": "NOT_DEFINED"
}
}
],
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"attackVector": "NETWORK",
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"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"availabilityImpact": "NONE"
},
"exploitabilityScore": 3.9,
"impactScore": 2.5
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-08-14T18:30:16.393968Z",
"id": "CVE-2026-53786",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
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}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
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},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-863"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*",
"versionEndExcluding": "3.5.0",
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"references": [
{
"url": "https://github.com/RsyncProject/rsync/releases/tag/v3.5.0",
"source": "[email protected]",
"tags": [
"Product",
"Release Notes"
]
},
{
"url": "https://github.com/RsyncProject/rsync/security/advisories/GHSA-mrc3-6cwx-hch6",
"source": "[email protected]",
"tags": [
"Vendor Advisory"
]
},
{
"url": "https://www.vulncheck.com/advisories/rsync-filter-rule-bypass-via-filter-merge-directive",
"source": "[email protected]",
"tags": [
"Release Notes",
"Third Party Advisory"
]
}
]
}