Link following in Rsync - CVE-2026-53784

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Main Vulnerability Database Vulnerabilities #VU142295

Link following in Rsync - CVE-2026-53784

Published: August 13, 2026


Vulnerability identifier: #VU142295
CSH Severity: Low
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-53784
CWE-ID: CWE-59
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to disclose sensitive information and modify served content outside the configured module root.

The vulnerability exists due to improper link resolution before file access in the daemon module-root chdir logic when changing directory into the module path with use chroot = no. A local user can place a parent-component symlink to make the daemon serve files from outside the configured module root to disclose sensitive information and modify served content outside the configured module root.

Exploitation requires the daemon to be configured with use chroot = no, and the issue occurs before any transfer begins.


Affected software

Rsync
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
Debian Linux
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
Anolis OS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Basesystem Module
openSUSE Leap
openEuler
Fedora
rsync (Red Hat package)
rsync-doc
rsync-daemon
rsync
rsync-debugsource
rsync-debuginfo
rsync-help
rsync (Debian package)

How to mitigate CVE-2026-53784

Install security update from vendor's website.

Rsync - update to 3.5.0
rsync (Red Hat package) - addressed in versions 3.1.3-28.el8_10, 3.5.0-3.el10_2
rsync-doc - update to 3.1.3-28.0.1
rsync-daemon - update to 3.1.3-28.0.1
rsync - update to 3.1.3-28.0.1
rsync-debugsource - addressed in versions 3.2.3-150400.3.34.1, 3.2.7-150600.3.24.1
rsync - addressed in versions 3.2.3-150400.3.34.1, 3.2.7-150600.3.24.1
rsync-debuginfo - addressed in versions 3.2.3-150400.3.34.1, 3.2.7-150600.3.24.1
rsync-help - update to 3.2.7-12
rsync-debugsource - update to 3.2.7-12
rsync-debuginfo - update to 3.2.7-12
rsync - update to 3.2.7-12
rsync - addressed in versions 3.5.0-1.fc43, 3.5.0-1.fc44
rsync (Debian package) - update to 3.5.0+ds1-0+deb13u1

External References

Related Security Bulletins