CVE-2026-53799

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.

CVSS v3 6.3 MEDIUM

6.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.0 / Impact : 5.2

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/RsyncProject/rsync/releases/tag/v3.5.0	Product Release Notes
https://github.com/RsyncProject/rsync/security/advisories/GHSA-phxh-hjqv-39c9	Vendor Advisory
https://www.vulncheck.com/advisories/rsync-symlink-race-condition-via-acl-xattr-application	Release Notes Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*

History

23 Oct 2026, 18:10

Type	Values Removed	Values Added
Summary		(es) rsync anterior a la versión 3.5.0 contiene una vulnerabilidad de condición de carrera de enlace simbólico que permite a atacantes locales hacer que rsync aplique ACLs arbitrarias o atributos extendidos a archivos no deseados al sustituir un enlace simbólico en una ruta de destino predecible entre la escritura del archivo y la subsiguiente llamada a acl_set_file() o lsetxattr(). Los atacantes pueden explotar esta ventana de tiempo para redirigir la aplicación de ACL y xattr a través de un enlace simbólico manipulado a archivos fuera del árbol de destino previsto, lo que podría otorgar permisos elevados y permitir la escalada de privilegios local.

Information

Published : 2026-08-13 15:19

Updated : 2026-10-24 16:10

NVD link : CVE-2026-53799

Mitre link : CVE-2026-53799

CVE.ORG link : CVE-2026-53799

JSON object : View

Products Affected

samba

rsync

CWE

CWE-59

Improper Link Resolution Before File Access ('Link Following')

CWE-367

Time-of-check Time-of-use (TOCTOU) Race Condition

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