The CentOS Linux 6 host has a package installed that is affected by multiple vulnerabilities as referenced in the TuxCare CENTOS6:CLSA-2026:1791331932 advisory.

  - rsync before 3.5.0 contains multiple command and argument injection vulnerabilities that allow attackers     to execute arbitrary commands by supplying malicious input through several code paths, including the     RSYNC_CONNECT_PROG environment variable, daemon hooks, the rsync-ssl wrapper, and remote-shell command     newline injection. Attackers can inject shell metacharacters or newline characters into unsanitized user-     supplied values such as hostnames and hostspecs to execute arbitrary commands under the privileges of the     rsync process or the invoking user. (CVE-2026-53790)

  - rsync before 3.5.0 contains a path confinement bypass vulnerability that allows remote clients to escape     the intended inner-module root confinement by constructing paths that resolve outside the chroot boundary     when the module root contains a /./ boundary marker. Attackers can exploit improper handling of the /./     notation or forge delta-basis transfers referencing xname paths that cross the /./ boundary to gain     unauthorized read or write access to files outside the module's subtree. (CVE-2026-53793)

  - rsync before 3.5.0 contains an algorithmic complexity vulnerability in the hash_search() function that     allows a remote attacker to cause a denial of service by delivering a carefully constructed file list. A     sender can exploit the quadratic-time worst-case behavior in hash lookups to exhaust receiver CPU     resources with a modest number of crafted entries, causing a sustained denial of service. (CVE-2026-70453)

  - rsync 3.0.0 before 3.5.0 contains an out-of-bounds write vulnerability that allows attackers to corrupt     memory by triggering HLINK_BUMP processing on file entries with the FLAG_HLINKED flag set while the hard-     link preservation option is inactive. Attackers can exploit the missing F_SUM field in the file_struct     layout to access memory past the end of the allocated structure, corrupting adjacent heap or stack data.
    (CVE-2026-70458)

  - rsync daemon 2.0.0 before 3.5.0 contains a denial of service vulnerability that allows unauthenticated     remote attackers to exhaust daemon connection slots by stalling the handshake process before or after     module selection without triggering the I/O timeout. Attackers can open many simultaneous connections and     trickle data at the minimum rate to avoid timeout, or stall entirely before module selection where no     timeout applies, consuming all available connection slots and denying service to legitimate clients.
    (CVE-2026-70464)

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

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CentOS Linux 6 [TuxCare] Security Update: rsync Multiple Vulnerabilities (CENTOS6:CLSA-2026:1791331932)

critical Nessus Plugin ID 364648

Version 1.2