Bug 2515369 (CVE-2026-53786)

Summary: CVE-2026-53786 rsync: rsync: Information disclosure via filter rule bypass using malicious merge directives
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in rsync. This vulnerability allows authenticated clients to bypass module-level filter restrictions. By supplying malicious merge file directives, an attacker can inject rules that override the daemon's intended file exclusion policies. This leads to information disclosure, as attackers can gain unauthorized access to files that should have been restricted.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2529407, 2529408    
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Description OSIDB Bzimport 2026-08-13 15:49:30 UTC 
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.