SB20260921166 - Red Hat Enterprise Linux 8 update for openssh

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB20260921166

SB20260921166 - Red Hat Enterprise Linux 8 update for openssh

Published: September 21, 2026 Updated: September 30, 2026

Security Bulletin ID SB20260921166
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Medium 25% Low 75%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Path traversal (CVE-ID: CVE-2026-59995)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to write files to an unexpected location.

The vulnerability exists due to improper path restriction in sftp(1) when downloading files on the command line using a remote path and a local dot destination. A remote attacker can operate a malicious server to write files to an unexpected location.



2) Improper access control (CVE-ID: CVE-2026-59999)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to enable tunneling despite forwarding restrictions.

The vulnerability exists due to improper access control in sshd(8) when DisableForwarding=yes and PermitTunnel=yes are configured together. A remote privileged user can use tunneling despite forwarding restrictions to enable tunneling despite forwarding restrictions.

Exploitation requires configurations where PermitTunnel is enabled.


3) Use-after-free (CVE-ID: CVE-2026-73282)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to use-after-free in the ssh client remote forwarding handling when a remote forwarding is added via the local session multiplexing socket while a remote forwarding open request is pending with the server. A remote user can trigger this race condition to cause a denial of service.

Exploitation requires access to the local session multiplexing socket while a remote forwarding open request is pending.


4) Untrusted search path (CVE-ID: CVE-2023-38408)

CWE-ID: CWE-426 - Untrusted Search Path

CVSSv4: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to usage of an insecure search path within the PKCS#11 feature in ssh-agent. A remote attacker can trick the victim into connecting to a malicious SSH server and execute arbitrary code on the system, if an agent is forwarded to an attacker-controlled system.

Note, this vulnerability exists due to incomplete fix for #VU2015 (CVE-2016-10009).


Remediation

Install update from vendor's website.

References