CVE-2026-53790

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.

Score

CVSS 4.0 9.2 Critical

Status

Awaiting Analysis - disclosure@vulncheck.com

Published

2026-08-13

Last modified

2026-10-24

Weaknesses

CWE-78, CWE-88

Affected products

• Rsync (Samba)

References

• https://github.com/RsyncProject/rsync/security/advisories/GHSA-5hcf-7xxm-rmqq
• https://github.com/RsyncProject/rsync/releases/tag/v3.5.0
• https://www.vulncheck.com/advisories/rsync-command-injection-via-multiple-code-paths