CVE-2026-53790

rsync < 3.5.0 Command Injection via Multiple Code Paths

State: Published
Severity: 9.2 Critical
Published: Aug 13, 2026
Updated: Aug 14, 2026
Reserved: Jun 10, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	9.2 Critical	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	8.1 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-88 Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

Affected Products

Product	Versions
rsyncRsyncProject	3.4.4 and earlierAffected 3.5.0Not affected

References

GitHub Security Advisory (GHSA-5hcf-7xxm-rmqq)vendor-advisory
rsync 3.5.0 Release Notesrelease-notes
https://www.vulncheck.com/advisories/rsync-command-injection-via-multiple-code-pathsthird-party-advisory

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