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rsync daemon EUVDEUVD-2026-58040

| CVE-2026-70464 HIGH
Allocation of Resources Without Limits or Throttling (CWE-770)
2026-08-13 VulnCheck
Denial Of Service Rsync Suse
8.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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-reachable with no authentication or user interaction required; impact is availability-only with no scope change beyond the daemon process.

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
7.5 HIGH
AV:N/AC:L/PR:N/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:H/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 - 15:39 vuln.today
Analysis Generated
Aug 13, 2026 - 15:39 vuln.today
CVE Published
Aug 13, 2026 - 14:41 cve.org
HIGH 8.7

DescriptionCVE.org

rsync daemon 2.0.0 before 3.5.0 contains a denial of service vulnerability that allows unauthenticated remote attackers to exhaust daemon connection slots by stalling the handshake process before or after module selection without triggering the I/O timeout. Attackers can open many simultaneous connections and trickle data at the minimum rate to avoid timeout, or stall entirely before module selection where no timeout applies, consuming all available connection slots and denying service to legitimate clients.

AnalysisAI

Connection slot exhaustion in rsync daemon versions 2.0.0 through 3.4.x allows unauthenticated remote attackers to deny service to legitimate clients by stalling the protocol handshake across two distinct vectors. Pre-module-selection stalls are unconditionally effective because the daemon applies no timeout in that phase; post-module-selection, attackers can trickle data just above the I/O timeout floor to hold slots indefinitely while never completing the handshake. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Connect to exposed rsyncd TCP port
Delivery
Hold connection in pre-module-selection phase (no timeout enforced)
Exploit
Script hundreds of parallel stalled connections
Execution
Exhaust all available daemon connection slots
Impact
Deny service to legitimate rsync clients
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Vulnerability AssessmentAI

Exploitation The rsync daemon must be running in network-accessible daemon mode (rsyncd) and reachable by the attacker over TCP - client-only rsync usage is not affected. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.7 (AV:N/AC:L/AT:N/PR:N/UI:N/VA:H) accurately reflects the low friction required: no authentication, no complexity, no user interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker scripts hundreds of simultaneous TCP connections to an exposed rsyncd port and holds each connection open during the pre-module-selection phase by simply never sending the module name - no timeout is enforced in this phase, so slots remain held indefinitely. Once all connection slots are occupied, the daemon begins refusing new connections, causing legitimate rsync clients to receive connection-refused errors. …
Remediation Upgrade rsync to version 3.5.0 or later, confirmed as a major security release addressing this vulnerability; the release is available at https://github.com/RsyncProject/rsync/releases/tag/v3.5.0 with full changelog at https://download.samba.org/pub/rsync/NEWS#3.5.0. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all production systems running rsync daemon and document their exact versions (check: rsync --version and process listings). …

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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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EUVD-2026-58040 vulnerability details – vuln.today
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