High [CVE-2026-53784] Unauthorized File Access via Symlink Module Root
This high-severity Red Hat Linux advisory covers CVE-2026-53784 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 6.
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Summary
rsync before 3.5.0 contains a path traversal vulnerability that allows remote clients to access files outside the intended module root when use chroot is disabled and the module root path or a component of it is a symlink.
The daemon calls chdir() to the module root at session initialization without resolving symlinks via realpath() or equivalent, causing subsequent relative-path operations to reference files relative to the symlink target rather than the intended module root, enabling unauthorized file access. A flaw was found in rsync.
This is an Important flaw. The rsync daemon is vulnerable to unauthorized file access via path traversal when configured with a symlinked module root and the `use chroot` option is explicitly disabled.
This configuration is not default, but if present, a local attacker with low privileges could exploit this to read or write files outside the intended module root. Red Hat severity: Important — CVSS 7.1 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N).
Weakness: CWE-59. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat OpenShift Container Platform 4.
Red Hat fixing advisory: RHSA-2026:67463, RHSA-2026:67462.
Affected products named by the advisory: Red Hat package: rsync.
- < 3.5.0
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
- 3.5.0
- rsync-0:3.5.0-3.el10_2
- rsync-0:3.2.7-1.el9_8
- RHSA-2026:67463
- RHSA-2026:67462
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation checklist
- To mitigate this vulnerability, ensure that the `use chroot` option is enabled in the rsync daemon configuration. If `use chroot` cannot be enabled, avoid using symlinks as the module root path or any of its components in the rsync daemon configuration. After modifying the rsync configuration, restart the rsync service for the changes to take effect.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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