RCE in Rsyncproject Rsync
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.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.002
Affected products
- Rsyncproject Rsync — versions 0, 3.5.0
Weakness classification (CWE)
References
- github.com/RsyncProject/rsync/releases/tag/v3.5.0 (release-notes)
- github.com/RsyncProject/rsync/security/advisories/GHSA-5hcf-7xxm-rmqq (vendor-advisory)
- www.vulncheck.com/advisories/rsync-command-injection-via-multiple-code-paths (third-party-advisory)
Frequently asked questions
- What is CVE-2026-53790?
- CVE-2026-53790 is a high-severity vulnerability in Rsyncproject Rsync, classified under OS Command Injection. CVSS score: 8.1/10. Published 2026-08-13.
- How severe is CVE-2026-53790?
- High severity. CVSS v3 base score is 8.1 out of 10.