{"id":"DEBIAN-CVE-2026-44507","details":"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issue is fixed in version 3.4.3.","modified":"2026-07-22T02:00:43.293476810Z","published":"2026-07-20T21:16:46.973Z","withdrawn":"2026-07-22T02:00:43.293476610Z","upstream":["CVE-2026-44507"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-44507"}],"affected":[{"package":{"name":"rsync","ecosystem":"Debian:11","purl":"pkg:deb/debian/rsync?arch=source&distro=bullseye"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.3-4","3.2.3-4+deb11u1","3.2.3-4+deb11u2","3.2.3-4+deb11u3","3.2.3-4+deb11u4","3.2.3-5","3.2.3-6","3.2.3-7","3.2.3-8","3.2.4-1","3.2.4-1~bpo11+1","3.2.5-1","3.2.6-1","3.2.6-2","3.2.6-3","3.2.6-4","3.2.7-1","3.2.7-1~bpo11+1","3.3.0+ds1-1","3.3.0+ds1-2","3.3.0+ds1-3","3.3.0+ds1-4","3.3.0-1","3.4.1+ds1-1","3.4.1+ds1-2","3.4.1+ds1-3","3.4.1+ds1-4","3.4.1+ds1-4~exp1","3.4.1+ds1-4~exp2","3.4.1+ds1-5","3.4.1+ds1-5~exp1","3.4.1+ds1-6","3.4.1+ds1-7","3.4.1+ds1-8~exp1","3.4.2+ds1-1","3.4.2+ds1-2","3.4.3+ds1-1","3.4.3+ds1-2","3.4.4+ds1-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44507.json"}},{"package":{"name":"rsync","ecosystem":"Debian:12","purl":"pkg:deb/debian/rsync?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.7-1","3.2.7-1+deb12u1","3.2.7-1+deb12u2","3.2.7-1+deb12u3","3.2.7-1+deb12u4","3.2.7-1+deb12u5","3.2.7-1+deb12u6","3.3.0+ds1-1","3.3.0+ds1-2","3.3.0+ds1-3","3.3.0+ds1-4","3.3.0-1","3.4.1+ds1-1","3.4.1+ds1-2","3.4.1+ds1-3","3.4.1+ds1-4","3.4.1+ds1-4~exp1","3.4.1+ds1-4~exp2","3.4.1+ds1-5","3.4.1+ds1-5~exp1","3.4.1+ds1-6","3.4.1+ds1-7","3.4.1+ds1-8~exp1","3.4.2+ds1-1","3.4.2+ds1-2","3.4.3+ds1-1","3.4.3+ds1-2","3.4.4+ds1-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44507.json"}},{"package":{"name":"rsync","ecosystem":"Debian:13","purl":"pkg:deb/debian/rsync?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.4.1+ds1-5","3.4.1+ds1-5+deb13u1","3.4.1+ds1-5+deb13u2","3.4.1+ds1-5+deb13u3","3.4.1+ds1-5+deb13u4","3.4.1+ds1-6","3.4.1+ds1-7","3.4.1+ds1-8~exp1","3.4.2+ds1-1","3.4.2+ds1-2","3.4.3+ds1-1","3.4.3+ds1-2","3.4.4+ds1-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44507.json"}},{"package":{"name":"rsync","ecosystem":"Debian:14","purl":"pkg:deb/debian/rsync?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.3+ds1-1"}]}],"versions":["3.4.1+ds1-5","3.4.1+ds1-6","3.4.1+ds1-7","3.4.1+ds1-8~exp1","3.4.2+ds1-1","3.4.2+ds1-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44507.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"}]}