Linux Distros Unpatched Vulnerability : CVE-2026-4426

medium Nessus Plugin ID 303063

Language:

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 libarchive. An Undefined Behavior vulnerability exists in the zisofs decompression logic, caused by improper validation of a field (`pz_log2_bs`) read from ISO9660 Rock Ridge extensions. A remote attacker can exploit this by supplying a specially crafted ISO file. This can lead to incorrect memory allocation and potential application crashes, resulting in a denial-of-service (DoS) condition.
(CVE-2026-4426)

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

Solution

There is no known solution at this time.

Plugin Details

Severity: Medium

ID: 303063

File Name: unpatched_CVE_2026_4426.nasl

Version: 1.3

Type: local

Agent: unix

Family: Misc.

Published: 3/19/2026

Updated: 3/20/2026

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: High

Base Score: 7.8

Temporal Score: 6.6

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

CVSS Score Source: CVE-2026-4426

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 6

Vector: CVSS:3.0/AV:N/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:bsdcpio, p-cpe:/a:centos:centos:libarchive, cpe:/o:debian:debian_linux:12.0, cpe:/o:redhat:enterprise_linux:9, cpe:/o:centos:centos:8, p-cpe:/a:redhat:enterprise_linux:libarchive-devel, p-cpe:/a:centos:centos:libarchive-devel, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:10, cpe:/o:debian:debian_linux:13.0, p-cpe:/a:redhat:enterprise_linux:bsdcpio, p-cpe:/a:redhat:enterprise_linux:bsdtar, cpe:/o:centos:centos:7, cpe:/o:redhat:enterprise_linux:7, cpe:/o:debian:debian_linux:14.0, p-cpe:/a:debian:debian_linux:libarchive, p-cpe:/a:redhat:enterprise_linux:libarchive, p-cpe:/a:centos:centos:bsdtar

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

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 3/19/2026

Reference Information

CVE: CVE-2026-4426

Detections

Analytics