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Linux Distros Unpatched Vulnerability : CVE-2026-0967

medium Nessus Plugin ID 298588

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Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

 - A flaw was found in libssh. A remote attacker, by controlling client configuration files or known_hosts files, could craft specific hostnames that when processed by the `match_pattern()` function can lead to inefficient regular expression backtracking. This can cause timeouts and resource exhaustion, resulting in a Denial of Service (DoS) for the client. (CVE-2026-0967)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

See Also

https://access.redhat.com/security/cve/cve-2026-0967

https://security-tracker.debian.org/tracker/CVE-2026-0967

Plugin Details

Severity: Medium

ID: 298588

File Name: unpatched_CVE_2026_0967.nasl

Version: 1.10

Type: Local

Agent: unix

Family: Misc.

Published: 2/10/2026

Updated: 4/14/2026

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 4.2

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

CVSS Score Source: CVE-2026-0967

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 5.1

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

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:centos:centos:libssh-config, cpe:/o:redhat:enterprise_linux:9, cpe:/o:redhat:enterprise_linux:8, p-cpe:/a:debian:debian_linux:libssh, cpe:/o:centos:centos:8, p-cpe:/a:redhat:enterprise_linux:libssh-devel, p-cpe:/a:centos:centos:libssh, p-cpe:/a:redhat:enterprise_linux:libssh-config, p-cpe:/a:centos:centos:libssh-devel, p-cpe:/a:redhat:enterprise_linux:libssh, cpe:/o:debian:debian_linux:12.0, cpe:/o:redhat:enterprise_linux:10, cpe:/o:debian:debian_linux:13.0

Required KB Items: Host/cpu, Host/local_checks_enabled, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Reference Information

CVE: CVE-2026-0967

IAVA: 2026-A-0166