Out-of-bounds read in Rsync - CVE-2026-43620

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU133148

Out-of-bounds read in Rsync - CVE-2026-43620

Published: June 1, 2026


Vulnerability identifier: #VU133148
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-43620
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to an out-of-bounds read in recv_files() when processing a crafted file list and transfer record from a malicious server. A remote attacker can send a crafted file list and transfer record to cause a denial of service.

The issue is reachable by any client pulling from a malicious server, and no special options are required on the victim because inc_recurse is the protocol-30+ default.


Affected software

Rsync
Gentoo Linux
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
Debian Linux
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Micro
Ubuntu
Basesystem Module
openSUSE Leap
openEuler
Fedora
LANTIME Operating System Firmware (LTOS)
rsync (Ubuntu package)
rsync
rsync-debuginfo
rsync-debugsource
rsync-help
rsync (Debian package)
net-misc/rsync

How to mitigate CVE-2026-43620

Install security update from vendor's website.

Rsync - update to 3.4.3
LANTIME Operating System Firmware (LTOS) - update to 7.10.012
rsync (Ubuntu package) - addressed in versions 3.1.0-2ubuntu0.4+esm3, 3.1.0-2ubuntu0.4+esm4, 3.1.1-3ubuntu1.3+esm5, 3.1.1-3ubuntu1.3+esm6, 3.1.2-2.1ubuntu1.6+esm3, 3.1.2-2.1ubuntu1.6+esm4, 3.1.3-8ubuntu0.9+esm1, 3.1.3-8ubuntu0.9+esm2, 3.2.7-0ubuntu0.22.04.6, 3.2.7-0ubuntu0.22.04.7, 3.2.7-1ubuntu1.4, 3.2.7-1ubuntu1.5, 3.4.1+ds1-7ubuntu0.2, 3.4.1+ds1-7ubuntu0.3, 3.4.1+ds1-5ubuntu1.2, 3.4.1+ds1-5ubuntu1.3
rsync - addressed in versions 3.1.3-3.43.1, 3.2.3-150400.3.31.1, 3.2.7-7.1, 3.2.7-150600.3.21.1, 3.3.0-slfo.1.1_6.1
rsync-debuginfo - addressed in versions 3.1.3-3.43.1, 3.2.3-150400.3.31.1, 3.2.7-7.1, 3.2.7-150600.3.21.1, 3.3.0-slfo.1.1_6.1
rsync-debugsource - addressed in versions 3.1.3-3.43.1, 3.2.3-150400.3.31.1, 3.2.7-7.1, 3.2.7-150600.3.21.1, 3.3.0-slfo.1.1_6.1
rsync-debuginfo - addressed in versions 3.1.3-14, 3.2.5-8, 3.2.7-11
rsync - addressed in versions 3.1.3-14, 3.2.5-8, 3.2.7-11
rsync-debugsource - addressed in versions 3.1.3-14, 3.2.5-8, 3.2.7-11
rsync-help - addressed in versions 3.1.3-14, 3.2.5-8, 3.2.7-11
rsync (Debian package) - addressed in versions 3.2.7-1+deb12u5, 3.4.1+ds1-5+deb13u3
net-misc/rsync - update to 3.4.3
rsync - addressed in versions 3.4.3-1.fc43, 3.4.3-1.fc44, 3.4.4-1.fc43

External References

Related Security Bulletins