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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… (CVE-2026-53792)

0
Medium
VulnerabilityCVE-2026-53792gcveosvubuntu-cve-2026-53792cve-2026-53792ubuntu-pro-14-04-ltsubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-22-04-ltsubuntu-24-04-ltsubuntu-26-10ubuntu-26-04-lts
Published: 08/13/2026 (08/13/2026, 15:19:00 UTC)
Source: GCVE Database
Product: rsync

Description

An out-of-bounds read vulnerability exists in rsync versions before 3.5.0 in the sender-side block matching logic. A malicious receiver can send a specially crafted checksum block with zero length, causing a negative offset calculation and resulting in memory access before the start of an allocated buffer on the sender side. This vulnerability has a CVSS score of 6.5 and is classified as medium severity.

CVSS v3.1

Score 6.5medium

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected software

Ubuntu:Pro:14.04:LTSmore threats →ghsa
rsync
pkg:deb/ubuntu/rsync?arch=source&distro=esm-infra-legacy/trusty
Affected versions
=3.0.9-4ubuntu1=3.1.0-2=3.1.0-2ubuntu0.1=3.1.0-2ubuntu0.2=3.1.0-2ubuntu0.3=3.1.0-2ubuntu0.4=3.1.0-2ubuntu0.4+esm1=3.1.0-2ubuntu0.4+esm2=3.1.0-2ubuntu0.4+esm3=3.1.0-2ubuntu0.4+esm4
Ubuntu:Pro:16.04:LTSmore threats →ghsa
rsync
pkg:deb/ubuntu/rsync?arch=source&distro=esm-infra-legacy/xenial
Affected versions
=3.1.1-3=3.1.1-3ubuntu1=3.1.1-3ubuntu1.1=3.1.1-3ubuntu1.2=3.1.1-3ubuntu1.3=3.1.1-3ubuntu1.3+esm1=3.1.1-3ubuntu1.3+esm2=3.1.1-3ubuntu1.3+esm3=3.1.1-3ubuntu1.3+esm4=3.1.1-3ubuntu1.3+esm5=3.1.1-3ubuntu1.3+esm6
Ubuntu:Pro:18.04:LTSmore threats →ghsa
rsync
pkg:deb/ubuntu/rsync?arch=source&distro=esm-infra/bionic
Affected versions
=3.1.2-2=3.1.2-2.1=3.1.2-2.1ubuntu1=3.1.2-2.1ubuntu1.1=3.1.2-2.1ubuntu1.2=3.1.2-2.1ubuntu1.3=3.1.2-2.1ubuntu1.4=3.1.2-2.1ubuntu1.5=3.1.2-2.1ubuntu1.6=3.1.2-2.1ubuntu1.6+esm1=3.1.2-2.1ubuntu1.6+esm2=3.1.2-2.1ubuntu1.6+esm3=3.1.2-2.1ubuntu1.6+esm4
Ubuntu:Pro:20.04:LTSmore threats →ghsa
rsync
pkg:deb/ubuntu/rsync?arch=source&distro=esm-infra/focal
Affected versions
=3.1.3-6=3.1.3-8=3.1.3-8ubuntu0.1=3.1.3-8ubuntu0.2=3.1.3-8ubuntu0.3=3.1.3-8ubuntu0.4=3.1.3-8ubuntu0.5=3.1.3-8ubuntu0.7=3.1.3-8ubuntu0.8=3.1.3-8ubuntu0.9=3.1.3-8ubuntu0.9+esm1=3.1.3-8ubuntu0.9+esm2
Ubuntu:22.04:LTSmore threats →ghsa
rsync
pkg:deb/ubuntu/rsync?arch=source&distro=jammy
Affected versions
=3.2.3-4ubuntu1=3.2.3-4ubuntu2=3.2.3-8ubuntu1=3.2.3-8ubuntu2=3.2.3-8ubuntu3=3.2.3-8ubuntu3.1=3.2.7-0ubuntu0.22.04.2=3.2.7-0ubuntu0.22.04.3=3.2.7-0ubuntu0.22.04.4=3.2.7-0ubuntu0.22.04.6=3.2.7-0ubuntu0.22.04.7
Ubuntu:24.04:LTSmore threats →ghsa
rsync
pkg:deb/ubuntu/rsync?arch=source&distro=noble
Affected versions
=3.2.7-1=3.2.7-1build1=3.2.7-1build2=3.2.7-1ubuntu1=3.2.7-1ubuntu1.1=3.2.7-1ubuntu1.2=3.2.7-1ubuntu1.4=3.2.7-1ubuntu1.5
Ubuntu:26.10more threats →ghsa
rsync
pkg:deb/ubuntu/rsync?arch=source&distro=stonking
Affected versions
=3.4.1+ds1-7=3.4.4+ds1-1=3.4.4+ds1-1build1=3.5.0+ds1-2
Ubuntu:26.04:LTSmore threats →ghsa
rsync
pkg:deb/ubuntu/rsync?arch=source&distro=resolute
Affected versions
=3.4.1+ds1-5ubuntu1=3.4.1+ds1-6=3.4.1+ds1-7=3.4.1+ds1-7ubuntu0.2=3.4.1+ds1-7ubuntu0.3

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 10/18/2026, 00:51:42 UTC

Technical Analysis

The vulnerability in rsync before version 3.5.0 is an out-of-bounds read in the sender-side block matching logic. It occurs when a malicious receiver sends a crafted checksum block with a length of zero, triggering a negative offset calculation during delta computation. This leads to reading memory before the allocated buffer on the sender side, potentially causing a denial of service. The issue is identified as CVE-2026-53792 with a CVSS 3.1 score of 6.5 (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).

Potential Impact

The vulnerability allows a malicious receiver to cause an out-of-bounds read on the sender side, which can lead to denial of service (application crash or instability). There is no indication of confidentiality or integrity impact. No known exploits in the wild have been reported.

Mitigation Recommendations

A fix is available in rsync version 3.5.0 and later. Users should upgrade to version 3.5.0 or newer to remediate this vulnerability. No vendor advisory content was provided to indicate alternative mitigations or if the issue is already mitigated in specific environments.

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-53792
Osv Schema Version
1.7.0
Ecosystems
["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.10","Ubuntu:26.04:LTS"]
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6ad3f6012cdf04f656664009

Added to database: 10/17/2026, 22:26:09 UTC

Last enriched: 10/18/2026, 00:51:42 UTC

Last updated: 10/18/2026, 00:51:42 UTC

Views: 3

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