High [CVE-2026-53790] rsync < 3.5.0 Command Injection via Multiple Code Paths
This high-severity Red Hat Linux advisory covers CVE-2026-53790 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
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Summary
rsync before 3.5.0 contains multiple command and argument injection vulnerabilities that allow attackers to execute arbitrary commands by supplying malicious input through several code paths, including the RSYNC_CONNECT_PROG environment variable, daemon hooks, the rsync-ssl wrapper, and remote-shell command newline injection.
Attackers can inject shell metacharacters or newline characters into unsanitized user-supplied values such as hostnames and hostspecs to execute arbitrary commands under the privileges of the rsync process or the invoking user.
This Important vulnerability in rsync allows for remote command injection due to insufficient sanitization of user-supplied input across multiple code paths.
While the attack complexity is high, successful exploitation could lead to arbitrary command execution under the privileges of the rsync process or the invoking user, impacting confidentiality, integrity, and availability. This risk is particularly relevant in environments where rsync is used for remote synchronization with untrusted sources or destinations.
Red Hat severity: Important — CVSS 8.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-78.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4.
- < 3.5.0
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- Do not set RSYNC_CONNECT_PROG or pass untrusted hostnames/paths into rsync / rsync-ssl. If rsyncd is required, omit pre-xfer/post-xfer/early exec unless the command ignores client-controlled RSYNC_* values, and restrict TCP/873 to trusted clients
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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