CVE-2026-53793: CWE-59 Improper Link Resolution Before File Access ('Link Following') in RsyncProject rsync
CVE-2026-53793 is a critical vulnerability in rsync versions up to 3.4.4 that allows remote clients to bypass path confinement. By exploiting improper handling of the /./ boundary marker in module roots, attackers can access files outside the intended directory subtree, potentially gaining unauthorized read or write access.
AI Analysis
Technical Summary
This vulnerability in rsync before version 3.5.0 involves a path confinement bypass caused by improper link resolution before file access (CWE-59). When the module root contains a /./ boundary marker, remote clients can construct paths that resolve outside the chroot boundary. This can be exploited by manipulating the /./ notation or forging delta-basis transfers referencing paths that cross this boundary, thereby escaping the intended confinement and accessing files outside the module's subtree.
Potential Impact
Exploitation of this vulnerability can lead to unauthorized read or write access to files outside the intended directory subtree of the rsync module. This compromises the confidentiality and integrity of files on the affected system. The CVSS 4.0 base score of 9.1 reflects a critical severity with network attack vector, high complexity, and no privileges required.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, avoid using rsync modules with /./ boundary markers in the module root or restrict access to trusted clients only.
CVE-2026-53793: CWE-59 Improper Link Resolution Before File Access ('Link Following') in RsyncProject rsync
Description
CVE-2026-53793 is a critical vulnerability in rsync versions up to 3.4.4 that allows remote clients to bypass path confinement. By exploiting improper handling of the /./ boundary marker in module roots, attackers can access files outside the intended directory subtree, potentially gaining unauthorized read or write access.
CVSS v4.0
Score 9.1critical
Affected software
RsyncProject
rsync
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in rsync before version 3.5.0 involves a path confinement bypass caused by improper link resolution before file access (CWE-59). When the module root contains a /./ boundary marker, remote clients can construct paths that resolve outside the chroot boundary. This can be exploited by manipulating the /./ notation or forging delta-basis transfers referencing paths that cross this boundary, thereby escaping the intended confinement and accessing files outside the module's subtree.
Potential Impact
Exploitation of this vulnerability can lead to unauthorized read or write access to files outside the intended directory subtree of the rsync module. This compromises the confidentiality and integrity of files on the affected system. The CVSS 4.0 base score of 9.1 reflects a critical severity with network attack vector, high complexity, and no privileges required.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, avoid using rsync modules with /./ boundary markers in the module root or restrict access to trusted clients only.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-06-10T20:14:32.827Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a7ddec4bf8831d5395cfca1
Added to database: 08/13/2026, 15:12:04 UTC
Last enriched: 08/21/2026, 13:37:47 UTC
Last updated: 09/26/2026, 01:47:42 UTC
Views: 57
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