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rsync CVE-2026-53793

| EUVDEUVD-2026-58101 CRITICAL
Improper Link Resolution Before File Access (CWE-59)
2026-08-13 VulnCheck
Authentication Bypass Rsync Suse
9.1
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
9.1 CRITICAL
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/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
7.4 HIGH

Network-reachable daemon with anonymous modules gives PR:N; dependence on a specific '/./' chroot config and forged transfers gives AC:H; high read/write access but no availability loss yields C:H/I:H/A:N.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
SUSE
8.1 HIGH
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/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
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 13, 2026 - 15:53 vuln.today
Analysis Generated
Aug 13, 2026 - 15:53 vuln.today
CVE Published
Aug 13, 2026 - 14:38 cve.org
CRITICAL 9.1

DescriptionCVE.org

rsync before 3.5.0 contains a path confinement bypass vulnerability that allows remote clients to escape the intended inner-module root confinement by constructing paths that resolve outside the chroot boundary when the module root contains a /./ boundary marker. Attackers can exploit improper handling of the /./ notation or forge delta-basis transfers referencing xname paths that cross the /./ boundary to gain unauthorized read or write access to files outside the module's subtree.

AnalysisAI

Path confinement bypass in the rsync daemon (versions before 3.5.0) lets remote clients escape the intended per-module chroot root when a module path contains a '/./' boundary marker, granting unauthorized read or write access to files outside the module subtree. Reported by VulnCheck and carrying a CVSS 4.0 score of 9.1, the flaw is exploitable by mishandling the '/./' notation or by forging delta-basis (xname) transfers that cross the boundary. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Connect to rsync daemon on TCP 873
Delivery
Target module with /./ chroot root
Exploit
Craft path or forge delta-basis xname crossing boundary
Execution
Bypass path confinement
Impact
Read or write files outside module subtree
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Vulnerability AssessmentAI

Exploitation Exploitation requires the target to be running rsync in daemon mode with chroot enabled ('use chroot = yes') and at least one module whose configured path contains a '/./' boundary marker separating the chroot root from the inner module root; the attacker must be a remote client able to reach the daemon (default TCP 873) and must either abuse the '/./' path-notation handling or forge a delta-basis (xname) transfer that references paths crossing that boundary. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:H/AT:P/PR:N/UI:N, VC:H/VI:H/VA:N) scores 9.1 and reflects a genuine tension: it is network-reachable and unauthenticated (PR:N) with high confidentiality and integrity impact, but AC:H combined with AT:P signals that exploitation is not turnkey - it requires a specific server-side configuration (a module path containing a '/./' boundary marker under chroot) and non-trivial attacker effort to construct crossing paths or forge delta-basis transfers. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker connects as a remote client to an internet- or intranet-reachable rsync daemon whose module is defined under chroot with a '/./' boundary marker. By requesting paths that abuse the '/./' notation - or by forging a delta-basis transfer that references an xname path crossing the boundary - the attacker reads sensitive files (e.g., /etc credentials) or writes files outside the module subtree. …
Remediation Vendor-released patch: rsync 3.5.0 - upgrade all rsync daemon hosts to 3.5.0 or later, per the 3.5.0 security release (https://github.com/RsyncProject/rsync/releases/tag/v3.5.0) and advisory GHSA-wj7w-vh23-mm44. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all systems running rsync daemon and confirm which are running versions prior to 3.5.0. …

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

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Vendor StatusVendor

SUSE

Severity: Important
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-2026-53793 vulnerability details – vuln.today
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