rsync: Rsync is a file-copying tool that uses a delta-transfer algorithm to synchronize remote and local files
CVE-2026-44507 is fixed in rsync on 1 platform, first by DEBIAN-CVE-2026-44507, released July 21, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Rsync is a file-copying tool that uses a delta-transfer algorithm to synchronize remote and local files. In versions prior to 3.4.3, when using a daemon configured with a chroot, the reverse DNS lookup of the connecting client was performed after the chroot had been entered. If the chroot did not contain the files glibc needs for resolution (/etc/resolv.conf, /etc/nsswitch.conf, /etc/hosts, NSS service modules), the lookup failed and the connecting hostname was set to "UNKNOWN". Hostname-based deny rules ("hosts deny = *.evil.example") therefore could not match, and an attacker who controlled the PTR record for their source IP could connect from a hostname that the administrator had intended to deny. IP-based ACLs ("hosts allow = 10.0.0.0/8") are unaffected. This issue is fixed in version 3.4.3.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| rsync · Debian 14 | 3.4.3+ds1-1 | DEBIAN-CVE-2026-44507 | Jul 21, 2026 |
| rsync · opensuse-leap 16.0 | 3.4.1-160000.6.1 | OPENSUSE-SU-2026:21650-1 | Aug 26, 2026 |
| rsync · sles 16.0 | 3.4.1-160000.6.1 | SUSE-SU-2026:23323-1 | Aug 26, 2026 |
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