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RHEL 8 : libssh (RHSA-2026:20610)

high Nessus Plugin ID 316877

Synopsis

The remote Red Hat host is missing a security update for libssh.

Description

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:20610 advisory.

 libssh is a library which implements the SSH protocol. It can be used to implement client and server applications.

 Security Fix(es):

 * libssh: Incorrect Return Code Handling in ssh_kdf() in libssh (CVE-2025-5372)

 For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 RHEL libssh package based on the guidance in RHSA-2026:20610.

See Also

https://access.redhat.com/security/updates/classification/#moderate

https://bugzilla.redhat.com/show_bug.cgi?id=2369388

http://www.nessus.org/u?ebeeb768

https://access.redhat.com/errata/RHSA-2026:20610

Plugin Details

Severity: High

ID: 316877

File Name: redhat-RHSA-2026-20610.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 5/27/2026

Updated: 5/27/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

Vendor

Vendor Severity: Moderate

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

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

CVSS Score Source: CVE-2025-5372

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

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

CVSS v4

Risk Factor: High

Base Score: 7.6

Threat Score: 5

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:redhat:rhel_tus:8.8, p-cpe:/a:redhat:enterprise_linux:libssh-devel, p-cpe:/a:redhat:enterprise_linux:libssh-config, p-cpe:/a:redhat:enterprise_linux:libssh, cpe:/o:redhat:rhel_e4s:8.8

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

Exploit Ease: No known exploits are available

Patch Publication Date: 5/26/2026

Vulnerability Publication Date: 7/3/2025

Reference Information

CVE: CVE-2025-5372

CWE: 682

RHSA: 2026:20610