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rsync CVE-2026-70459

| EUVDEUVD-2026-58045 MEDIUM
Use of Uninitialized Resource (CWE-908)
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
5.3 MEDIUM

Unauthenticated network access with no complexity; scope unchanged and impact limited to low availability as only the child process crashes.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
SUSE
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Red Hat
5.3 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 - 16:02 vuln.today
Analysis Generated
Aug 13, 2026 - 16:02 vuln.today
CVE Published
Aug 13, 2026 - 14:43 cve.org
MEDIUM 6.9

DescriptionCVE.org

rsync 3.0.0 before 3.5.0 contains a null pointer dereference vulnerability in the daemon child process that allows remote attackers to crash the daemon by sending a file list whose first entry is a dot entry not typed as a directory. The daemon dereferences the first file list entry as a directory structure pointer without verifying the entry type, resulting in an invalid or uninitialized pointer dereference that terminates the client connection.

AnalysisAI

Remote unauthenticated crash of the rsync daemon affects all versions from 3.0.0 through 3.4.x. The daemon child process dereferences the first file list entry as a directory structure pointer without verifying its type, so a dot entry not typed as a directory triggers a null or uninitialized pointer dereference (CWE-908) that terminates the connection. Impact is constrained to availability - a denial-of-service against individual daemon connections - with no confidentiality or integrity exposure. No CISA KEV listing and no confirmed public exploit code exist at time of analysis.

Technical ContextAI

rsync is a widely-used file synchronization utility whose daemon mode (rsyncd) listens on TCP 873 and accepts file list data from remote clients. The vulnerable code path in the daemon child process reads the first entry of a client-supplied file list and unconditionally dereferences it as a directory structure pointer, relying on the assumption that this entry will have a directory type. When the entry is a dot ('.') but lacks the directory type flag, the pointer is invalid or uninitialized, producing a CWE-908 (Use of Uninitialized Resource) condition that causes a process crash. The affected CPE is cpe:2.3:a:rsyncproject:rsync:*:*:*:*:*:*:*:* covering the 3.0.0-3.4.x range. This issue is specific to daemon mode; rsync invoked over SSH does not expose the same code path to untrusted input.

RemediationAI

Vendor-released patch: rsync 3.5.0, confirmed as a major security release by the upstream project at https://github.com/RsyncProject/rsync/releases/tag/v3.5.0 and addressed in the security advisory at https://github.com/RsyncProject/rsync/security/advisories/GHSA-p4v4-qxw9-q72m. For deployments that cannot upgrade immediately, restrict access to TCP 873 via firewall rules to allow only known-trusted source IPs, which eliminates the unauthenticated network attack surface entirely; the trade-off is that any legitimate rsync daemon clients not on the allowlist will lose access. If SSH-based rsync is sufficient for all use cases, disabling the rsyncd service removes exposure with no functional loss for SSH-mode users. Applying hosts allow directives in rsyncd.conf to restrict client IP ranges is a lighter-weight daemon-level control, though misconfiguration risk means firewall enforcement is preferable.

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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-2026-70459 vulnerability details – vuln.today

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