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rsync CVE-2026-53799

| EUVDEUVD-2026-58037 HIGH
Improper Link Resolution Before File Access (CWE-59)
2026-08-13 VulnCheck
Privilege Escalation Rsync Suse
7.2
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
7.2 HIGH
CVSS:4.0/AV:L/AC:H/AT:N/PR:L/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
7.5 HIGH

Local-only race condition (AV:L, AC:H); low privileges required; scope changes as ACLs land on files outside attacker's permission domain; no availability impact.

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

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:L/AC:H/AT:N/PR:L/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
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 13, 2026 - 15:52 vuln.today
Analysis Generated
Aug 13, 2026 - 15:52 vuln.today
CVE Published
Aug 13, 2026 - 14:40 cve.org
HIGH 7.2

DescriptionCVE.org

rsync before 3.5.0 contains a symlink race condition vulnerability that allows local attackers to cause rsync to apply arbitrary ACLs or extended attributes to unintended files by substituting a symlink at a predictable destination path between the file write and the subsequent acl_set_file() or lsetxattr() call. Attackers can exploit this timing window to redirect ACL and xattr application through a crafted symlink to files outside the intended destination tree, potentially granting elevated permissions and enabling local privilege escalation.

AnalysisAI

Symlink race condition in rsync before 3.5.0 enables local privilege escalation by allowing an attacker to redirect ACL and extended attribute application to arbitrary files outside the intended destination tree. A low-privileged local attacker exploits the timing window between rsync's file write and the subsequent acl_set_file() or lsetxattr() call by substituting a crafted symlink at a predictable destination path, causing rsync to stamp permissions onto unintended files. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Gain low-privilege local shell access
Delivery
Identify predictable rsync destination path with ACL/xattr sync enabled
Exploit
Monitor filesystem for rsync file write event
Install
Race: replace destination file with symlink to target privileged file
C2
rsync applies attacker-specified ACL or xattr to symlink target
Execute
Privileged file permissions altered
Impact
Leverage modified ACL for local privilege escalation
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Vulnerability AssessmentAI

Exploitation Exploitation requires that rsync is invoked with --acls (to trigger acl_set_file()) or --xattrs (to trigger lsetxattr()), or both; without these flags the vulnerable code paths are never reached. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N) accurately captures the core risk profile: exploitation is locally constrained and complexity is high due to the inherent unreliability of race-condition timing. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A low-privileged local attacker on a multi-user system identifies that an automated rsync job runs periodically with --acls enabled, synchronizing files to a predictable destination path under /tmp or a world-accessible directory. The attacker monitors for the file write and, in the window before acl_set_file() is called, replaces the destination with a symlink to /etc/shadow or another privileged file. …
Remediation The primary remediation is upgrading rsync to version 3.5.0 or later, which is confirmed as a major security release addressing this flaw per the GitHub release tag (https://github.com/RsyncProject/rsync/releases/tag/v3.5.0) and the upstream NEWS file 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: audit all systems to identify rsync installations prior to version 3.5.0 and document which local user accounts have execution access. …

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Same weakness CWE-59 – Improper Link Resolution Before File Access

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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-2026-53799 vulnerability details – vuln.today
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