Resource exhaustion in Rsyncproject Rsync
CVE-2026-70464
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.008 (54.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.008 · change: +0.002
Affected products
- Rsyncproject Rsync — versions 2.0.0, 3.5.0
Weakness classification (CWE)
References
- github.com/RsyncProject/rsync/releases/tag/v3.5.0 (release-notes)
- github.com/RsyncProject/rsync/security/advisories/GHSA-hrwq-ccf7-rw5m (vendor-advisory)
- www.vulncheck.com/advisories/rsync-connection-slot-exhaustion-dos-via-handshake… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-70464?
- CVE-2026-70464 is a high-severity vulnerability in Rsyncproject Rsync, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-08-13.
- How severe is CVE-2026-70464?
- High severity. CVSS v3 base score is 7.5 out of 10.