CVE-2026-70464

rsync 2.0.0 < 3.5.0 Connection Slot Exhaustion DoS via Handshake Stall

Published: Aug 13, 2026Updated: Sep 8, 2026 Sources: CVE List NVDCWE-770

7.5HIGH

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:NIntegrity

None

A:HAvailability

High

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Weaknesses

CWE-770

Affected Products

RsyncProject

oss-projectaka rsync, rsync project

rsyncLibrary

OSS Libraries / generic-library

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Impact

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References

https://github.com/RsyncProject/rsync/security/advisories/GHSA-hrwq-ccf7-rw5m

github.com

https://github.com/RsyncProject/rsync/releases/tag/v3.5.0

github.com

https://www.vulncheck.com/advisories/rsync-connection-slot-exhaustion-dos-via-handshake-stall

vulncheck.com

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