Integer overflow in Rsyncproject Rsync
CVE-2026-70462
rsync 3.1.0 before 3.5.0 contains a signed integer overflow vulnerability in the I/O timeout implementation that allows attackers to permanently disable connection timeouts by injecting MSG_IO_TIMEOUT messages carrying non-positive (zero or negative) values. Attackers can craft malicious MSG_IO_TIMEOUT messages that cause the timeout variable to wrap to a non-positive value, preventing the timeout check from firing and enabling idle or stalled connections to hold daemon slots indefinitely, leading to resource exhaustion.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (36.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Rsyncproject Rsync — versions 3.1.0, 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-j9wh-5jmp-2m64 (vendor-advisory)
- www.vulncheck.com/advisories/rsync-signed-integer-overflow-via-msg-io-timeout (third-party-advisory)
Frequently asked questions
- What is CVE-2026-70462?
- CVE-2026-70462 is a medium-severity vulnerability in Rsyncproject Rsync, classified under Integer Overflow or Wraparound. CVSS score: 6.5/10. Published 2026-08-13.
- How severe is CVE-2026-70462?
- Medium severity. CVSS v3 base score is 6.5 out of 10.