CVE-2026-53793: rsync < 3.5.0 Path Confinement Bypass via /./ Boundary Marker in Chroot Mode
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
rsyncto a version that resolves this vulnerability.Fixed in 3.5.0
Event History
Frequently Asked Questions
What is the severity of CVE-2026-53793?
The severity of CVE-2026-53793 is high with a score of 7.4.
How do I fix CVE-2026-53793?
To fix CVE-2026-53793, upgrade rsync to version 3.5.0 or later.
What is the impact of CVE-2026-53793?
CVE-2026-53793 allows attackers to bypass path confinement and potentially access files outside the intended chroot environment.
In which versions of rsync is CVE-2026-53793 present?
CVE-2026-53793 is present in rsync versions prior to 3.5.0.
What type of vulnerability is CVE-2026-53793?
CVE-2026-53793 is a path confinement bypass vulnerability.