Vulnerability in Rsyncproject Rsync
CVE-2026-53788
rsync before 3.5.0 contains a newline injection vulnerability in the name-converter uid/gid mapping interface that allows local attackers to forge protocol messages by creating user or group names containing newline characters. Attackers can inject malicious newline characters into names communicated over the pipe-based line-oriented protocol to cause the rsync daemon to process attacker-influenced data as legitimate protocol input, corrupting uid/gid mapping logic.
Vulnerability class: CRLF Injection
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (25.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.001
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-p4c5-8c68-5fjq (vendor-advisory)
- www.vulncheck.com/advisories/rsync-newline-injection-via-name-converter-uid-gid… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-53788?
- CVE-2026-53788 is a medium-severity vulnerability in Rsyncproject Rsync, classified under CRLF Injection. CVSS score: 6.5/10. Published 2026-08-13.
- How severe is CVE-2026-53788?
- Medium severity. CVSS v3 base score is 6.5 out of 10.