CVE-2026-53793 rsync < 3.5.0 Path Confinement Bypass via /./ Boundary Marker in Chroot Mode
Remote attackers can bypass chroot confinement in rsync to read or write files outside the module root when a specific path marker is present.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-53793?
CVE-2026-53793 is a critical path traversal vulnerability in RsyncProject rsync, published on 13 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-59
Which versions are affected by CVE-2026-53793?
How do I fix CVE-2026-53793?
Upgrade to a fixed version.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-53793 being exploited?
There is no known exploitation of CVE-2026-53793 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-53793, AZL-95798, BELL-CVE-2026-53793, DEBIAN-CVE-2026-53793, ECHO-0bd3-4392-43db, GHSA-wj7w-vh23-mm44 and 2 more.