Detections
Analytics
Unity Linux 20.1050a / 20.1060a / 20.1070a Security Update: openssh (UTSA-2026-104839)
medium Nessus Plugin ID 340898
Synopsis
The Unity Linux host is missing one or more security updates.Description
The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-104839 advisory.A flaw was found in OpenSSH. A local unprivileged attacker on a Linux client host can hijack client-side X11 forwarding connections. This is possible by pre-binding the preferred abstract X socket name when X11 forwarding is enabled and a local UNIX-domain X socket is used. A successful attack can compromise the confidentiality of forwarded X11 traffic, including sensitive window contents and input, and may allow some manipulation of the forwarded session.
Tenable has extracted the preceding description block directly from the Unity Linux security advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Update the affected openssh package.See Also
https://access.redhat.com/security/cve/CVE-2026-55655
Plugin Details
Severity: Medium
ID: 340898
File Name: unity_linux_UTSA-2026-104839.nasl
Version: 1.1
Type: Local
Published: 8/26/2026
Updated: 8/26/2026
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3.5
Percentile: 51.86
CVSS v2
Risk Factor: Medium
Base Score: 5.6
Temporal Score: 4.1
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:P/A:N
CVSS Score Source: CVE-2026-55655
CVSS v3
Risk Factor: Medium
Base Score: 6.1
Temporal Score: 5.3
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
Required KB Items: Host/local_checks_enabled, Host/cpu, Host/UOS-Server/release, Host/UOS-Server/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 8/27/2026
Vulnerability Publication Date: 6/23/2026
Reference Information
CVE: CVE-2026-55655