Detections
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CentOS 9 : openssh-9.9p1-13.el9

medium Nessus Plugin ID 339711

Synopsis

The remote CentOS host is missing one or more security updates for openssh.

Description

The remote CentOS Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the openssh-9.9p1-13.el9 build changelog.

 - Fix information disclosure and data corruption via use-after-free in ssh client (CVE-2026-73282)

 - Fix misinteraction between agent locking and the [email protected] extension (CVE-2026-73281)

 - Complete the fix of security bypass due to incorrect handling of forwarding and tunneling options (CVE-2026-73283)

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 CentOS 9 Stream openssh package.

See Also

https://kojihub.stream.centos.org/koji/buildinfo?buildID=125650

Plugin Details

Severity: Medium

ID: 339711

File Name: centos9_openssh-9_9p1-13_125650.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 8/26/2026

Updated: 8/26/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.1

Percentile: 7.92

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

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

CVSS Score Source: CVE-2026-73282

CVSS v3

Risk Factor: Medium

Base Score: 4.8

Temporal Score: 4.2

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

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

Vulnerability Information

CPE: cpe:/a:centos:centos:9, p-cpe:/a:centos:centos:openssh-askpass, p-cpe:/a:centos:centos:openssh-clients, p-cpe:/a:centos:centos:openssh-keycat, p-cpe:/a:centos:centos:openssh-server, p-cpe:/a:centos:centos:openssh-sk-dummy, p-cpe:/a:centos:centos:openssh, p-cpe:/a:centos:centos:pam_ssh_agent_auth

Required KB Items: Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 8/21/2026

Vulnerability Publication Date: 8/11/2026

Reference Information

CVE: CVE-2026-73281, CVE-2026-73282, CVE-2026-73283

IAVA: 2026-A-0847