CVE-2026-53783

rsync < 3.5.0 TOCTOU Race Condition Directory Escape via rrsync

State: Published
Severity: 8.6 High
Published: Aug 13, 2026
Updated: Aug 14, 2026
Reserved: Jun 10, 2026

Description

rsync before 3.5.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability in the rrsync restricted shell wrapper that allows authenticated clients to escape enforced directory restrictions by substituting a symlink for a path component after validation but before transfer processing. Attackers can additionally leverage unrestricted flags such as --copy-unsafe-links, -D, and --log-file through rrsync to read or write files outside the permitted directory subtree.

Scores

CVSS	Score	Vector	Source
4.0	8.6 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N	VulnCheck
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N	VulnCheck

Weaknesses

CWE-59 Improper Link Resolution Before File Access ('Link Following')
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-9cgc-64g4-3gv5)vendor-advisory
rsync 3.5.0 Release Notesrelease-notes
https://www.vulncheck.com/advisories/rsync-toctou-race-condition-directory-escape-via-rrsyncthird-party-advisory

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