CVE-2026-70464
rsync 2.0.0 < 3.5.0 Connection Slot Exhaustion DoS via Handshake Stall
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
rsync daemon 2.0.0 before 3.5.0 contains a denial of service vulnerability that allows unauthenticated remote attackers to exhaust daemon connection slots by stalling the handshake process before or after module selection without triggering the I/O timeout. Attackers can open many simultaneous connections and trickle data at the minimum rate to avoid timeout, or stall entirely before module selection where no timeout applies, consuming all available connection slots and denying service to legitimate clients.
| CWE | CWE-770 |
| Vendor | rsyncproject |
| Product | rsync |
| Published | Aug 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
RsyncProject / rsync
2.0.0 ≤ 3.4.4
References
Credits
mruprich