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Vulnerability · Published Aug 13, 2026 · Assigned by VulnCheck

CVE-2026-53792rsync < 3.5.0 Out-of-Bounds Read via Zero-Length Checksum Block

Medium 6.5

In plain English

A medium-severity out-of-bounds write 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 24% 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 76.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

rsync before 3.5.0 contains an out-of-bounds read vulnerability in the sender-side block matching logic that allows a malicious receiver to trigger memory access before the start of an allocated buffer by sending a crafted checksum block with a length of zero. Attackers can send a specially crafted checksum set containing a zero-length block to cause a negative offset calculation during delta computation, resulting in an out-of-bounds read of file data buffer memory on the sender side.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.21rsync3.5.0-r0ALPINE-CVE-2026-53792
Alpine:v3.22rsync3.5.0-r0ALPINE-CVE-2026-53792
Alpine:v3.23rsync3.5.0-r0ALPINE-CVE-2026-53792
Alpine:v3.24rsync3.5.0-r0ALPINE-CVE-2026-53792
Debian:12rsyncno fix listedDEBIAN-CVE-2026-53792
Debian:13rsync3.5.0+ds1-0+deb13u1DEBIAN-CVE-2026-53792
Debian:14rsync3.5.0+ds1-1DEBIAN-CVE-2026-53792
Ubuntu:22.04:LTSrsyncno fix listedUBUNTU-CVE-2026-53792
Ubuntu:24.04:LTSrsyncno fix listedUBUNTU-CVE-2026-53792
Ubuntu:26.04:LTSrsyncno fix listedUBUNTU-CVE-2026-53792
Ubuntu:26.10rsyncno fix listedUBUNTU-CVE-2026-53792

Affected products (as reported)

VendorProductVersions
RsyncProject rsync 0 – through 3.4.4

Weakness: CWE-129, CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References