Rsync version 3.4.2 and prior contain an authorization bypass vulnerability in the rsync daemon's hostname-based access control list enforcement when configured with chroot. Attackers can bypass hostname-based deny rules by controlling the PTR record for their source IP address, allowing connections from hostnames that administrators intended to deny when reverse DNS resolution fails and defaults to UNKNOWN.

slackware SSA:2026-141-02: [slackware-security] rsync (SSA:2026-141-02)

ubuntu_linux USN-8283-1: Ubuntu 22.04 LTS / Ubuntu 24.04 LTS / Ubuntu 25.10 / Ubuntu 26.04 LTS : rsync vulnerabilities (USN-8283-1)

The remote Debian 11 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-4591 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4591-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                    Thorsten Alteholz     May 20, 2026                                  https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : rsync     Version        : 3.2.3-4+deb11u4     CVE ID         : CVE-2026-29518 CVE-2026-43617 CVE-2026-43618                      CVE-2026-43619 CVE-2026-43620


    Several vulnerabilities were discovered in rsync, a fast, versatile,     remote (and local) file-copying tool, which may result in local     privilege escalation, bypass of intended access restrictions, remote     memory disclosure to an authenticated daemon peer or denial of service.


    For Debian 11 bullseye, these problems have been fixed in version     3.2.3-4+deb11u4.

    We recommend that you upgrade your rsync packages.

    For the detailed security status of rsync please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/rsync

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 12 / 13 host has a package installed that is affected by multiple vulnerabilities as referenced in the dsa-6282 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6282-1                   security@debian.org     https://www.debian.org/security/                     Salvatore Bonaccorso     May 20, 2026                          https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : rsync     CVE ID         : CVE-2026-29518 CVE-2026-43617 CVE-2026-43618 CVE-2026-43619                      CVE-2026-43620 CVE-2026-45232

    Several vulnerabilities were discovered in rsync, a fast, versatile,     remote (and local) file-copying tool, which may result in local     privilege escalation, bypass of intended access restrictions, remote     memory disclosure to an authenticated daemon peer or denial of service.

    For the oldstable distribution (bookworm), these problems have been fixed     in version 3.2.7-1+deb12u5.

    For the stable distribution (trixie), these problems have been fixed in     version 3.4.1+ds1-5+deb13u3.

    We recommend that you upgrade your rsync packages.

    For the detailed security status of rsync please refer to its security     tracker page at:
    https://security-tracker.debian.org/tracker/rsync

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Rsync version 3.4.2 and prior contain an authorization bypass vulnerability in the rsync daemon's     hostname-based access control list enforcement when configured with chroot. Attackers can bypass hostname-     based deny rules by controlling the PTR record for their source IP address, allowing connections from     hostnames that administrators intended to deny when reverse DNS resolution fails and defaults to UNKNOWN.
    (CVE-2026-43617)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
315780	Debian dla-4591 : rsync - security update	Nessus	Debian Local Security Checks	high
315779	Debian dsa-6282 : rsync - security update	Nessus	Debian Local Security Checks	high
315597	Linux Distros Unpatched Vulnerability : CVE-2026-43617	Nessus	Misc.	medium

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