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Fencer Vulns
high 8.1

CVE-2026-43618 json

Rsync < 3.4.3 Integer Overflow Information Disclosure

published 2026-05-20 5 mo ago modified 2026-11-08 24 h ago also EUVD-2026-31011 , GHSA-88m5-cm5m-2596 , JLSEC-2026-629

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

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.

Patch / fix

  • julia rsync_jll 3.4.4+0
  • RsyncProject rsync 3.4.3
  • Red Hat Red Hat Enterprise Linux 10 0:3.4.4-1.el10_2
  • Red Hat Red Hat Enterprise Linux 8 0:3.1.3-27.el8_10
  • Red Hat Red Hat Enterprise Linux 9 0:3.2.5-7.el9_8.2
  • Red Hat Red Hat Discovery 2 1782166952
  • rsync Debian 12 3.2.7-1+deb12u5
  • rsync Debian 13 3.4.1+ds1-5+deb13u3
  • rsync Debian 14 3.4.3+ds1-1

debian advisories DEBIAN-CVE-2026-43618

  • rsync Ubuntu 22.04 LTS 3.2.7-0ubuntu0.22.04.6
  • rsync Ubuntu 24.04 LTS 3.2.7-1ubuntu1.4
  • rsync Ubuntu 25.10 3.4.1+ds1-5ubuntu1.2
  • rsync Ubuntu 26.04 LTS 3.4.1+ds1-7ubuntu0.2
  • rsync Ubuntu Pro 14.04 LTS 3.1.0-2ubuntu0.4+esm3
  • rsync Ubuntu Pro 16.04 LTS 3.1.1-3ubuntu1.3+esm5
  • rsync Ubuntu Pro 18.04 LTS 3.1.2-2.1ubuntu1.6+esm3
  • rsync Ubuntu Pro 20.04 LTS 3.1.3-8ubuntu0.9+esm1

ubuntu advisories UBUNTU-CVE-2026-43618

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • rsync RHEL 9 3.2.5-7.el9_8.2
  • rsync-daemon RHEL 9 3.2.5-7.el9_8.2
  • rsync-rrsync RHEL 9 3.2.5-7.el9_8.2
  • rsync RHEL 8 3.1.3-27.el8_10
  • rsync-daemon RHEL 8 3.1.3-27.el8_10
  • rsync RHEL 10.2 3.4.4-1.el10_2
  • rsync-daemon RHEL 10.2 3.4.4-1.el10_2
  • rsync-rrsync RHEL 10.2 3.4.4-1.el10_2

red hat advisories RHSA-2026:26410RHSA-2026:26408RHSA-2026:26332

  • rsync SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 3.4.1-160000.6.1
  • rsync Linux Micro 6.0 3.2.7-8.1
  • rsync SLES for SAP applications 16.0, SLES 16.0 3.4.1-160000.4.1

suse advisories SUSE-SU-2026:23289-1SUSE-SU-2026:23323-1SUSE-SU-2026:23253-1SUSE-SU-2026:22015-1

  • rsync openSUSE Leap 16.0 3.4.1-160000.6.1
  • rsync openSUSE Tumbleweed 3.4.3-1.1

opensuse advisories openSUSE-SU-2026:21650-1openSUSE-SU-2026:10857-1

  • rsync AlmaLinux 10 3.4.4-1.el10_2
  • rsync-daemon AlmaLinux 10 3.4.4-1.el10_2
  • rsync-rrsync AlmaLinux 10 3.4.4-1.el10_2
  • rsync AlmaLinux 8 3.1.3-27.el8_10
  • rsync-daemon AlmaLinux 8 3.1.3-27.el8_10
  • rsync AlmaLinux 9 3.2.5-7.el9_8.2
  • rsync-daemon AlmaLinux 9 3.2.5-7.el9_8.2
  • rsync-rrsync AlmaLinux 9 3.2.5-7.el9_8.2

almalinux advisories ALSA-2026:26332ALSA-2026:26408ALSA-2026:26410

  • rsync Rocky Linux 10 3.4.4-1.el10_2
  • rsync Rocky Linux 9 3.2.5-7.el9_8.2
  • rsync Rocky Linux 8 3.1.3-27.el8_10

rocky linux advisories RLSA-2026:26332RLSA-2026:26410RLSA-2026:26408

  • rsync Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 3.4.3-r0

alpine advisories ALPINE-CVE-2026-43618

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • rsync Azure Linux 3.0 3.4.3-1

azure linux advisories AZL-86988

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-43618 updated cvss 8.1

rsync: rsync: Remote memory disclosure via integer overflow in compressed-token decoding

  • Red Hat Enterprise Linux 6 rsync Red Hat Enterprise Linux 7 rsync Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: workaround, no fix available
  • Red Hat Discovery 2 discovery/discovery-ui-rhel9 1782166952
    fixed: vendor fix RHSA-2026:29197
  • Red Hat Enterprise Linux AppStream (v. 9) rsync-daemon 3.2.5-7.el9_8.2, rsync-rrsync 3.2.5-7.el9_8.2
    fixed: vendor fix RHSA-2026:26410
  • Red Hat Enterprise Linux AppStream (v. 10) rsync-daemon 3.4.4-1.el10_2, rsync-rrsync 3.4.4-1.el10_2
    fixed: vendor fix RHSA-2026:26332
  • Red Hat Enterprise Linux BaseOS (v. 8) rsync 3.1.3-27.el8_10, rsync-daemon 3.1.3-27.el8_10
    fixed: vendor fix RHSA-2026:26408
  • Red Hat Enterprise Linux BaseOS (v. 9) rsync 3.2.5-7.el9_8.2
    fixed: vendor fix RHSA-2026:26410
  • Red Hat Enterprise Linux BaseOS (v. 10) rsync 3.4.4-1.el10_2
    fixed: vendor fix RHSA-2026:26332
  • Red Hat Discovery 2 discovery/discovery-server-rhel9 1782159791
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
5 mo ago

Exploit prediction

0.78% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 6.1 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CISA ADP 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 4.0 6.1 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
OSV 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia rsync_jll
<3.4.4+0
3.4.4+0

Affected products

  • RsyncProject rsync
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Discovery 2
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.