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rsync EUVDEUVD-2026-58093

| CVE-2026-53786 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
Red Hat
6.5 MEDIUM
qualitative

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

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. No public exploit has been identified at time of analysis, and the vendor has released a fix in v3.5.0 designated as a major security release.

Technical ContextAI

rsync is a widely-used file synchronization utility that supports a daemon mode (rsyncd) where modules define accessible directory trees and apply server-side filter rules to restrict file visibility. The --filter option supports merge-file directives (e.g., ': /path/to/rules') that load additional filter rules from a file. CWE-863 (Incorrect Authorization) describes the root cause: the daemon improperly evaluates client-supplied merge file directives during filter rule processing, allowing client-controlled input to inject rules that take precedence over daemon-configured module restrictions. The affected CPE is cpe:2.3:a:rsyncproject:rsync:*:*:*:*:*:*:*:* covering all versions before 3.5.0. This is a server-side authorization enforcement failure, not a client-side issue.

RemediationAI

Upgrade rsync to version 3.5.0 or later, which the RsyncProject has designated as a major security release. The release is available at https://github.com/RsyncProject/rsync/releases/tag/v3.5.0 and the security advisory is at https://github.com/RsyncProject/rsync/security/advisories/GHSA-mrc3-6cwx-hch6. If an immediate upgrade is not possible, restrict rsync daemon module access to explicitly trusted, authenticated clients by enabling per-module auth users and secrets file settings in rsyncd.conf, which reduces the attack surface to authenticated sessions only. Additionally, consider disabling daemon-mode rsync entirely if not required and replacing with SSH-tunneled rsync (rsync over SSH does not use the daemon filter path). Restricting incoming connections to the rsync daemon port (default TCP 873) via firewall to only known trusted source IPs is a viable compensating control but does not eliminate the vulnerability for environments where broad client access is intentional. Distribution-maintained packages (Debian, Ubuntu, RHEL, Alpine) should be monitored for updated package versions backporting the fix.

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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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EUVD-2026-58093 vulnerability details – vuln.today

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