CVE-2026-70452
rsync 3.1.0 < 3.5.0 Access Control Bypass via DNS Resolution Failure
CVSS Score
7.4
EPSS Score
0.0%
EPSS Percentile
0th
rsync 3.1.0 before 3.5.0 contains an access control bypass vulnerability that allows remote attackers to circumvent hosts deny rules by inducing DNS resolution failures during hostname-based access control evaluation. When a DNS lookup for a hostname-based deny rule fails, the daemon skips the rule rather than defaulting to a deny decision, enabling attackers who can trigger DNS failures to bypass module-level IP access controls and gain unauthorized access to restricted module file trees.
| CWE | CWE-863 CWE-636 |
| Vendor | rsyncproject |
| Product | rsync |
| Published | Aug 13, 2026 |
Stay Ahead of the Next One
Get instant alerts for rsyncproject rsync
Be the first to know when new high vulnerabilities affecting rsyncproject rsync are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
RsyncProject / rsync
3.1.0 ≤ 3.4.4
References
Credits
buger