CVE-2026-70464 — rsync 2.0.0 < 3.5.0 Connection Slot Exhaustion DoS via Handshake Stall
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 handsh…
Published: 2026-08-13 · CVSS: 8.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7