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Vulnerabilities CVE-2026-53793

CVE-2026-53793

Critical
Open
TLP:CLEAR

rsync < 3.5.0 Path Confinement Bypass via /./ Boundary Marker in Chroot Mode

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Description

rsync before 3.5.0 contains a path confinement bypass vulnerability that allows remote clients to escape the intended inner-module root confinement by constructing paths that resolve outside the chroot boundary when the module root contains a /./ boundary marker. Attackers can exploit improper handling of the /./ notation or forge delta-basis transfers referencing xname paths that cross the /./ boundary to gain unauthorized read or write access to files outside the module's subtree.

Details

CVSS Score
9.1
CVSS Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Confidence
90%
Published
Aug 13, 2026
Last Modified
Aug 13, 2026
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