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rsync CVE-2026-53794

| EUVDEUVD-2026-58033 MEDIUM
Improper Validation of Specified Quantity in Input (CWE-1284)
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:N/VI:N/VA:L/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
7.5 HIGH

Network-accessible with no authentication required and no user interaction; unbounded memory allocation can exhaust host memory, warranting A:H despite the CVSS 4.0 input rating VA:L.

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

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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 - 16:07 vuln.today
Analysis Generated
Aug 13, 2026 - 16:07 vuln.today
CVE Published
Aug 13, 2026 - 14:39 cve.org
MEDIUM 6.9

DescriptionCVE.org

rsync before 3.5.0 contains a logic error in --max-alloc handling that allows a sender or configuration setting --max-alloc=0 to disable allocation sanity checks entirely rather than enforcing a zero-byte cap. Attackers can exploit this flaw to cause the receiver to attempt unbounded memory allocations for file list and data structures, potentially exhausting available memory and causing a denial of service.

AnalysisAI

Memory exhaustion in rsync before 3.5.0 exposes receivers to remote denial of service through a logic error in --max-alloc handling, where passing --max-alloc=0 silently disables all allocation sanity checks instead of enforcing a zero-byte cap. Any rsync receiver reachable from an untrusted sender - including public mirrors and unauthenticated daemons - is at risk, as the CVSS 4.0 vector (AV:N/AC:L/PR:N/UI:N) confirms no authentication or special conditions are required to trigger the flaw. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify exposed rsync daemon on TCP/873
Delivery
Initiate unauthenticated sender session
Exploit
Supply --max-alloc=0 parameter
Execution
Transmit crafted oversized file list
Persist
Receiver attempts unbounded memory allocation
Impact
Host memory exhaustion triggers denial of service

Vulnerability AssessmentAI

Exploitation The attacker must be able to initiate an rsync sender session to a receiver running any version prior to 3.5.0 over the network (TCP/873 or SSH-tunneled rsync). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.9 with AV:N/AC:L/AT:N/PR:N/UI:N reflects a remotely exploitable, unauthenticated denial-of-service with low attack complexity - the conditions for exploitation are permissive. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker identifies a publicly accessible rsync daemon (TCP/873) running rsync before 3.5.0 and initiates a sync session as an unauthenticated sender, supplying --max-alloc=0 to disable the receiver's allocation bounds checks. The attacker then transmits a crafted file list containing entries that trigger large allocation requests, causing the receiver to exhaust available system memory, crash the rsync process, and potentially trigger host-level OOM conditions affecting co-located services. …
Remediation Vendor-released patch: v3.5.0. … 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-2026-53794 vulnerability details – vuln.today

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