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OpenAdvisories
High · 8.1 CVE-2026-43618 EUVD-2026-31011GHSA-88m5-cm5m-2596

Rsync < 3.4.3 Integer Overflow Information Disclosure

Published May 20, 2026 · Updated Nov 8, 2026 · Assigned by VulnCheck

Vendor: RsyncProject Product: rsync Package: rsync Package: rsync Package: rsync Package: rsync Ecosystem: Alpine Ecosystem: Azure Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

Rsync version 3.4.2 and prior contain an integer overflow vulnerability in the compressed-token decoder where a 32-bit signed counter is not checked for overflow, allowing a malicious sender to trigger an overflow that causes the receiver process to read and return data from outside the intended buffer bounds. Attackers can exploit this vulnerability to disclose process memory contents including environment variables, passwords, heap and stack data, and library memory pointers, significantly reducing ASLR effectiveness and facilitating further exploitation.

Affected products

VendorProductAffectedFixed
RsyncProject rsync < 3.4.3 3.4.3

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 rsync 3.4.3+ds1-1 —
Debian 13 rsync 3.4.1+ds1-5+deb13u3 —
Debian 12 rsync 3.2.7-1+deb12u5 —

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 26.04 LTS rsync 3.4.1+ds1-7ubuntu0.2 —
Ubuntu 25.10 rsync 3.4.1+ds1-5ubuntu1.2 —
Ubuntu 24.04 LTS rsync 3.2.7-1ubuntu1.4 —
Ubuntu 22.04 LTS rsync 3.2.7-0ubuntu0.22.04.6 —
Show 4 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro 20.04 LTS rsync 3.1.3-8ubuntu0.9+esm1 —
Ubuntu Pro 18.04 LTS rsync 3.1.2-2.1ubuntu1.6+esm3 —
Ubuntu Pro 16.04 LTS rsync 3.1.1-3ubuntu1.3+esm5 —
Ubuntu Pro 14.04 LTS rsync 3.1.0-2ubuntu0.4+esm3 —

Red Hat

Security tracker ↗
ReleasePackageFixed inAdvisory
RHEL 10 rsync +2 3.4.4-1.el10_2 RHSA-2026:26332
RHEL 9 rsync +2 3.2.5-7.el9_8.2 RHSA-2026:26410
RHEL 8 rsync +1 3.1.3-27.el8_10 RHSA-2026:26408

AlmaLinux

Errata ↗
ReleasePackageFixed inAdvisory
AlmaLinux 10 rsync +2 3.4.4-1.el10_2 ALSA-2026:26332
AlmaLinux 9 rsync +2 3.2.5-7.el9_8.2 ALSA-2026:26410
AlmaLinux 8 rsync +1 3.1.3-27.el8_10 ALSA-2026:26408

Rocky Linux

Errata ↗
ReleasePackageFixed inAdvisory
Rocky Linux 10 rsync 3.4.4-1.el10_2 RLSA-2026:26332
Rocky Linux 9 rsync 3.2.5-7.el9_8.2 RLSA-2026:26410
Rocky Linux 8 rsync 3.1.3-27.el8_10 RLSA-2026:26408

SUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
SLES for SAP 16.0 rsync 3.4.1-160000.4.1 SUSE-SU-2026:23323-1, SUSE-SU-2026:22015-1
SLES 16.0 rsync 3.4.1-160000.4.1 SUSE-SU-2026:23323-1, SUSE-SU-2026:22015-1
SLE Micro 6.2 rsync 3.4.1-160000.6.1 SUSE-SU-2026:23289-1
Show 1 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLE Micro 6.0 rsync 3.2.7-8.1 SUSE-SU-2026:23253-1

openSUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
openSUSE Tumbleweed rsync 3.4.3-1.1 openSUSE-SU-2026:10857-1
openSUSE Leap 16.0 rsync 3.4.1-160000.6.1 openSUSE-SU-2026:21650-1

Alpine

Security tracker ↗
ReleasePackageFixed inAdvisory
Alpine v3.24 rsync 3.4.3-r0 —
Alpine v3.23 rsync 3.4.3-r0 —
Alpine v3.22 rsync 3.4.3-r0 —
Alpine v3.21 rsync 3.4.3-r0 —
Alpine v3.20 rsync 3.4.3-r0 —

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2023 rsync +1 3.4.0-1.amzn2023.0.4 ALAS2023-2026-1801
Amazon Linux 2 rsync 3.1.2-11.amzn2.0.7 ALAS2-2026-3332

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 rsync 3.4.3-1 —

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 10 rsync +2 3.4.4-1.el10_2 ELSA-2026-26332
Oracle Linux 9 rsync +2 3.2.5-7.el9_8.2 ELSA-2026-26410
Oracle Linux 8 rsync +1 3.1.3-27.el8_10 ELSA-2026-26408

Advisories 22

References