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CentOS Linux 8.4 [TuxCare] Security Update: openssh / openssh-askpass / openssh-cavs / openssh-clients / etc Multiple Vulnerabilities (CENTOS8.4:CLSA-2026:1788885099)

high Nessus Plugin ID 359969

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Synopsis

The CentOS Linux host is missing one or more security updates.

Description

The CentOS Linux 8.4 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare CENTOS8.4:CLSA-2026:1788885099 advisory.

 - In OpenSSH before 10.3, command execution can occur via shell metacharacters in a username within a command line. This requires a scenario where the username on the command line is untrusted, and also requires a non-default configurations of % in ssh_config. (CVE-2026-35386)

 - In ssh in OpenSSH before 10.5, a use-after-free for realloc data can occur if a certain pair of remote- forwarding operations are concurrent. (CVE-2026-73282)

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

Solution

Update the affected packages based on the guidance in TuxCare advisory CENTOS8.4:CLSA-2026:1788885099.

See Also

https://cve.tuxcare.com/els/releases/CLSA-2026:1788885099

http://www.nessus.org/u?27c00321

Plugin Details

Severity: High

ID: 359969

File Name: tuxcare_centos_8.4_CLSA-2026-1788885099.nasl

Version: 1.3

Type: Local

Agent: unix

Published: 10/1/2026

Updated: 10/21/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.97

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: High

Base Score: 7.6

Temporal Score: 5.6

Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-35386

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.1

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Required KB Items: Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list, Host/OS/extended-third-party

Exploit Ease: No known exploits are available

Patch Publication Date: 9/8/2026

Vulnerability Publication Date: 8/11/2026

Reference Information

CVE: CVE-2026-35386, CVE-2026-73282

CLSA: 2026:1788885099