RockyLinux 9 : libssh (RLSA-2026:18683)

high Nessus Plugin ID 317435

Synopsis

The remote RockyLinux host is missing one or more security updates.

Description

The remote RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:18683 advisory.

* libssh: Double Free Vulnerability in libssh Key Export Functions (CVE-2025-5351)

* libssh: Use of uninitialized variable in privatekey_from_file() (CVE-2025-4878)

* libssh: Write beyond bounds in binary to base64 conversion functions (CVE-2025-4877)

* libssh: NULL Pointer Dereference in libssh KEX Session ID Calculation (CVE-2025-8114)

* libssh: Memory Exhaustion via Repeated Key Exchange in libssh (CVE-2025-8277)

* libssh: Buffer underflow in ssh_get_hexa() on invalid input (CVE-2026-0966)

* libssh: Improper sanitation of paths received from SCP servers (CVE-2026-0964)

* libssh: libssh: Denial of Service via improper configuration file handling (CVE-2026-0965)

* libssh: libssh: Denial of Service via inefficient regular expression processing (CVE-2026-0967)

* libssh: libssh: Denial of Service due to malformed SFTP message (CVE-2026-0968)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

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.

Plugin Details

Severity: High

ID: 317435

File Name: rocky_linux_RLSA-2026-18683.nasl

Version: 1.1

Type: Local

Family: Rocky Linux Local Security Checks

Published: 5/28/2026

Updated: 5/28/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.0

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.3

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

CVSS Score Source: CVE-2026-0966

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.1

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

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

Vulnerability Information

CPE: p-cpe:/a:rocky:linux:libssh, p-cpe:/a:rocky:linux:libssh-debugsource, p-cpe:/a:rocky:linux:libssh-debuginfo, p-cpe:/a:rocky:linux:libssh-devel, p-cpe:/a:rocky:linux:libssh-config, cpe:/o:rocky:linux:9

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

Exploit Ease: No known exploits are available

Patch Publication Date: 5/28/2026

Vulnerability Publication Date: 7/3/2025

Reference Information

CVE: CVE-2025-4877, CVE-2025-4878, CVE-2025-5351, CVE-2025-8114, CVE-2025-8277, CVE-2026-0964, CVE-2026-0965, CVE-2026-0966, CVE-2026-0967, CVE-2026-0968

Detections

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