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Vulnerability · Published Aug 13, 2026 · Assigned by VulnCheck

CVE-2026-70462rsync 3.1.0 < 3.5.0 Signed Integer Overflow via MSG_IO_TIMEOUT

Medium 6.5

In plain English

A medium-severity integer overflow in rsync from RsyncProject. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 78.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.21rsync3.5.0-r0ALPINE-CVE-2026-70462
Alpine:v3.22rsync3.5.0-r0ALPINE-CVE-2026-70462
Alpine:v3.23rsync3.5.0-r0ALPINE-CVE-2026-70462
Alpine:v3.24rsync3.5.0-r0ALPINE-CVE-2026-70462
Debian:12rsyncno fix listedDEBIAN-CVE-2026-70462
Debian:13rsync3.5.0+ds1-0+deb13u1DEBIAN-CVE-2026-70462
Debian:14rsync3.5.0+ds1-1DEBIAN-CVE-2026-70462
Ubuntu:22.04:LTSrsyncno fix listedUBUNTU-CVE-2026-70462
Ubuntu:24.04:LTSrsyncno fix listedUBUNTU-CVE-2026-70462
Ubuntu:26.04:LTSrsyncno fix listedUBUNTU-CVE-2026-70462
Ubuntu:26.10rsyncno fix listedUBUNTU-CVE-2026-70462

Affected products (as reported)

VendorProductVersions
RsyncProject rsync 3.1.0 – through 3.4.4

Weakness: CWE-190, CWE-835 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References