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rsync CVE-2026-53801

| EUVDEUVD-2026-58039 HIGH
Improper Link Resolution Before File Access (CWE-59)
2026-08-13 VulnCheck
Information Disclosure Rsync Suse
8.2
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.2 HIGH
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/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
5.3 MEDIUM

Creating or renaming symlinks in the scanned path requires write access, indicating at minimum low-privileged filesystem access (PR:L); AC:H reflects the race condition timing constraint.

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

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/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 - 15:52 vuln.today
Analysis Generated
Aug 13, 2026 - 15:52 vuln.today
CVE Published
Aug 13, 2026 - 14:41 cve.org
HIGH 8.2

DescriptionCVE.org

rsync before 3.5.0 contains a symlink race condition vulnerability in the sender's directory scanning logic that allows attackers to cause the sender to enumerate and transfer files outside the module root's intended subtree. Attackers who can create or manipulate symlinks in a path component of the scanned tree can replace a symlink with a directory entry pointing outside the module root between the lstat() call and the subsequent opendir() call, exposing files beyond the intended root in both daemon-mode and non-daemon sender-side scanning.

AnalysisAI

Symlink race condition in rsync before 3.5.0 allows directory traversal beyond the configured module root during sender-side scanning. Attackers with write access to a path component of the scanned tree can exploit a TOCTOU window between lstat() and opendir() system calls to redirect traversal outside the module boundary, causing rsync to enumerate and transfer files from unintended filesystem locations. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain write access to rsync module directory
Delivery
Plant symlink targeting out-of-root path
Exploit
Trigger rsync sender directory scan
Execution
Win race between lstat() and opendir() calls
Persist
Rsync descends into unauthorized directory
Impact
Enumerate and transfer files outside module root
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the attacker be able to create or manipulate symlinks within a path component of the rsync sender's scanned directory tree - this is the explicit prerequisite stated in the vulnerability description. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.2 with vector AV:N/AC:H/AT:N/PR:N/UI:N/VC:H captures a remotely exploitable, high-confidentiality-impact flaw constrained by high attack complexity (AC:H) due to the race condition timing requirement. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with write access to a directory within a read-write rsync daemon module uploads a symlink into the scanned tree pointing to a sensitive path outside the module root. When an rsync sender begins its directory scan, the attacker races to atomically replace the symlink with a real directory entry (e.g., via rename()) during the narrow window between lstat() and opendir(), causing rsync to descend into the out-of-scope directory. …
Remediation Upgrade rsync to version 3.5.0 or later, confirmed as the patching release by the GitHub release page at https://github.com/RsyncProject/rsync/releases/tag/v3.5.0 and the vendor security advisory GHSA-mch3-qr4p-chgm at https://github.com/RsyncProject/rsync/security/advisories/GHSA-mch3-qr4p-chgm. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all rsync deployments and identify instances running versions before 3.5.0, noting daemon/non-daemon mode and source directory scope. …

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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-2026-53801 vulnerability details – vuln.today
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