CVE-2026-43617
Fixed in a distro release EPSS <1%CVSS 4.8
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.
Products: RsyncProject rsync
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.20 | rsync | 3.4.3-r0 |
| Alpine 3.21 | rsync | 3.4.3-r0 |
| Alpine 3.22 | rsync | 3.4.3-r0 |
| Alpine 3.23 | rsync | 3.4.3-r0 |
| Alpine 3.24 | rsync | 3.4.3-r0 |
| Amazon Linux 2023 | rsync | 3.5.1-1.amzn2023.0.1 |
| Amazon Linux 2023 | rsync-daemon | 3.5.1-1.amzn2023.0.1 |
| Debian 12 | rsync | 3.2.7-1+deb12u5 |
| Debian 13 | rsync | 3.4.1+ds1-5+deb13u3 |
| Debian 14 | rsync | 3.4.3+ds1-1 |
| SUSE Linux Enterprise Server 16.0 | rsync | 3.4.1-160000.6.1 |
| SUSE Linux Enterprise Server 16.0 | rsync | 3.4.1-160000.4.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | rsync | 3.4.1-160000.4.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | rsync | 3.4.1-160000.6.1 |
| SUSE Linux Micro 6.0 | rsync | 3.2.7-8.1 |
| SUSE Linux Micro 6.2 | rsync | 3.4.1-160000.6.1 |
| Ubuntu 22.04 LTS | rsync | 3.2.7-0ubuntu0.22.04.6 |
| Ubuntu 22.04 LTS | rsync | 3.2.7-0ubuntu0.22.04.7 |
| Ubuntu 24.04 LTS | rsync | 3.2.7-1ubuntu1.4 |
| Ubuntu 24.04 LTS | rsync | 3.2.7-1ubuntu1.5 |
| Ubuntu 25.10 | rsync | 3.4.1+ds1-5ubuntu1.2 |
| Ubuntu 25.10 | rsync | 3.4.1+ds1-5ubuntu1.3 |
| Ubuntu 26.04 LTS | rsync | 3.4.1+ds1-7ubuntu0.2 |
| Ubuntu 26.04 LTS | rsync | 3.4.1+ds1-7ubuntu0.3 |
| Ubuntu Pro 14.04 LTS | rsync | 3.1.0-2ubuntu0.4+esm3 |
| Ubuntu Pro 14.04 LTS | rsync | 3.1.0-2ubuntu0.4+esm4 |
| Ubuntu Pro 16.04 LTS | rsync | 3.1.1-3ubuntu1.3+esm5 |
| Ubuntu Pro 16.04 LTS | rsync | 3.1.1-3ubuntu1.3+esm6 |
| Ubuntu Pro 18.04 LTS | rsync | 3.1.2-2.1ubuntu1.6+esm3 |
| Ubuntu Pro 18.04 LTS | rsync | 3.1.2-2.1ubuntu1.6+esm4 |
| Ubuntu Pro 20.04 LTS | rsync | 3.1.3-8ubuntu0.9+esm1 |
| Ubuntu Pro 20.04 LTS | rsync | 3.1.3-8ubuntu0.9+esm2 |
| openSUSE Leap 16.0 | rsync | 3.4.1-160000.6.1 |
| openSUSE Tumbleweed | rsync | 3.4.3-1.1 |