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rsync CVE-2026-53786

| EUVDEUVD-2026-58093 MEDIUM
Incorrect Authorization (CWE-863)
2026-08-13 VulnCheck
6.9
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.9 MEDIUM
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
vuln.today AI
6.5 MEDIUM

Network-reachable daemon, no credentials required per CVSS 4.0 PR:N; low C and I reflect partial file access bypass, no availability impact.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
SUSE
5.4 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 13, 2026 - 16:08 vuln.today
Analysis Generated
Aug 13, 2026 - 16:08 vuln.today
CVE Published
Aug 13, 2026 - 14:35 cve.org
MEDIUM 6.9

DescriptionCVE.org

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.

AnalysisAI

Filter rule bypass in rsync before 3.5.0 allows remote clients connecting to an rsync daemon to override module-level filter restrictions by injecting malicious --filter merge file directives during filter evaluation. The daemon's intended access controls - designed to restrict which files a module exposes - can be circumvented, granting the attacker read and limited write access to files the module filter was meant to exclude. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Connect to exposed rsync daemon on TCP 873
Delivery
Craft sync request with malicious --filter merge file directive
Exploit
Daemon evaluates client-supplied directive during filter processing
Execution
Injected rules supersede module-level access restrictions
Impact
Read restricted files outside intended module scope

Vulnerability AssessmentAI

Exploitation Exploitation requires network access to an rsync daemon (rsyncd) listening on TCP port 873 or equivalent. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) indicates low-complexity, unauthenticated network exploitation, but this conflicts with the description's reference to 'authenticated clients' - the actual authentication requirement depends on whether the target rsync module is configured to require credentials, which is not universal. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with network access to an exposed rsync daemon constructs a sync request that includes a malicious --filter merge file directive pointing to a client-controlled rule file. During filter evaluation, the daemon processes this directive, injecting rules that override the module-level restrictions, and the attacker gains read access to files outside the intended module scope - such as SSH keys, configuration files, or sensitive data directories that the module filter was designed to exclude. …
Remediation Upgrade rsync to version 3.5.0 or later, which the RsyncProject has designated as a major security release. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected
SUSE Linux Enterprise Micro 5.3 Affected

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CVE-2026-53786 vulnerability details – vuln.today

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