CVE-2026-53786

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.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/RsyncProject/rsync/releases/tag/v3.5.0	Product Release Notes
https://github.com/RsyncProject/rsync/security/advisories/GHSA-mrc3-6cwx-hch6	Vendor Advisory
https://www.vulncheck.com/advisories/rsync-filter-rule-bypass-via-filter-merge-directive	Release Notes Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*

History

23 Oct 2026, 18:10

Type	Values Removed	Values Added
Summary		(es) 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.

Information

Published : 2026-08-13 15:19

Updated : 2026-10-24 16:10

NVD link : CVE-2026-53786

Mitre link : CVE-2026-53786

CVE.ORG link : CVE-2026-53786

JSON object : View

Products Affected

samba

rsync

CWE

CWE-863

Incorrect Authorization

{"id": "CVE-2026-53786", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53786", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-14T18:30:16.393968Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.5, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.9, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "disclosure@vulncheck.com", "affectedData": [{"repo": "https://github.com/RsyncProject/rsync", "vendor": "RsyncProject", "product": "rsync", "versions": [{"status": "affected", "version": "0", "versionType": "semver", "lessThanOrEqual": "3.4.4"}, {"status": "unaffected", "version": "3.5.0", "versionType": "semver"}], "packageURL": "pkg:github/RsyncProject/rsync", "defaultStatus": "unaffected"}]}], "published": "2026-08-13T15:19:42.700", "references": [{"url": "https://github.com/RsyncProject/rsync/releases/tag/v3.5.0", "tags": ["Product", "Release Notes"], "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/RsyncProject/rsync/security/advisories/GHSA-mrc3-6cwx-hch6", "tags": ["Vendor Advisory"], "source": "disclosure@vulncheck.com"}, {"url": "https://www.vulncheck.com/advisories/rsync-filter-rule-bypass-via-filter-merge-directive", "tags": ["Release Notes", "Third Party Advisory"], "source": "disclosure@vulncheck.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-863"}]}], "descriptions": [{"lang": "en", "value": "rsync\u00a0before 3.5.0\u00a0contains 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 versi\u00f3n 3.5.0 contiene una vulnerabilidad de omisi\u00f3n de reglas de filtro que permite a clientes autenticados anular las restricciones de filtro a nivel de m\u00f3dulo al proporcionar directivas de archivo de fusi\u00f3n --filter maliciosas. Los atacantes pueden inyectar directivas de archivo de fusi\u00f3n del lado del cliente durante la evaluaci\u00f3n del filtro para introducir reglas que anulen las restricciones a nivel de m\u00f3dulo del demonio, obteniendo acceso a archivos que el filtro del m\u00f3dulo pretend\u00eda excluir."}], "lastModified": "2026-10-24T16:10:00.153", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6985EC7E-B9D3-4BD6-96F9-43F8322282E7", "versionEndExcluding": "3.5.0"}], "operator": "OR"}]}], "sourceIdentifier": "disclosure@vulncheck.com"}