Detections
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Linux Distros Unpatched Vulnerability : CVE-2026-4111

high Nessus Plugin ID 302158

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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 identified in the RAR5 archive decompression logic of the libarchive library, specifically within the archive_read_data() processing path. When a specially crafted RAR5 archive is processed, the decompression routine may enter a state where internal logic prevents forward progress. This condition results in an infinite loop that continuously consumes CPU resources. Because the archive passes checksum validation and appears structurally valid, affected applications cannot detect the issue before processing. This can allow attackers to cause persistent denial-of-service conditions in services that automatically process archives. (CVE-2026-4111)

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-2026-4111

https://security-tracker.debian.org/tracker/CVE-2026-4111

Plugin Details

Severity: High

ID: 302158

File Name: unpatched_CVE_2026_4111.nasl

Version: 1.2

Type: local

Agent: unix

Family: Misc.

Published: 3/13/2026

Updated: 3/13/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 4.3

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

CVSS Score Source: CVE-2026-4111

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.9

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

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

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 3/13/2026

Reference Information

CVE: CVE-2026-4111