Out-of-bounds write in Rsync - CVE-2026-70456

Vulnerability identifier: #VU142270

CSH Severity: High

CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-70456

CWE-ID: CWE-787

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to out-of-bounds write in read_args() when processing daemon client arguments that make glob expansion land the argument count exactly on maxargs. A remote attacker can send a specially crafted request to cause a denial of service or modify memory.

The write occurs when a trailing NULL pointer is written one pointer past the end of the heap allocation.

Rsync
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
Debian Linux
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
Anolis OS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Basesystem Module
openSUSE Leap
openEuler
Fedora
rsync (Red Hat package)
rsync-doc
rsync-daemon
rsync
rsync-debugsource
rsync-debuginfo
rsync-help
rsync (Debian package)

Install security update from vendor's website.

Rsync - update to 3.5.0
rsync (Red Hat package) - addressed in versions 3.1.3-28.el8_10, 3.5.0-3.el10_2
rsync-doc - update to 3.1.3-28.0.1
rsync-daemon - update to 3.1.3-28.0.1
rsync - update to 3.1.3-28.0.1
rsync-debugsource - addressed in versions 3.2.3-150400.3.34.1, 3.2.7-150600.3.24.1
rsync - addressed in versions 3.2.3-150400.3.34.1, 3.2.7-150600.3.24.1
rsync-debuginfo - addressed in versions 3.2.3-150400.3.34.1, 3.2.7-150600.3.24.1
rsync-help - update to 3.2.7-12
rsync-debugsource - update to 3.2.7-12
rsync-debuginfo - update to 3.2.7-12
rsync - update to 3.2.7-12
rsync - addressed in versions 3.5.0-1.fc43, 3.5.0-1.fc44
rsync (Debian package) - update to 3.5.0+ds1-0+deb13u1

• https://github.com/RsyncProject/rsync/security/advisories/GHSA-78jc-79jv-v6rw

• Multiple vulnerabilities in Rsync
• SUSE update for rsync
• Fedora 44 update for rsync
• Fedora 43 update for rsync
• SUSE update for rsync
• openEuler 24.03 LTS SP3 update for rsync
• openEuler 24.03 LTS SP1 update for rsync
• Red Hat Enterprise Linux 10 update for rsync
• openEuler 24.03 LTS SP4 update for rsync
• Debian update for rsync
• Red Hat Enterprise Linux 8 update for rsync
• Anolis OS update for rsync