Debian dla-4563 : libarchive-dev - security update

critical Nessus Plugin ID 312112

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4563 advisory.

- ------------------------------------------------------------------------- Debian LTS Advisory DLA-4563-1 [email protected] https://www.debian.org/lts/security/ Arnaud Rebillout May 05, 2026 https://wiki.debian.org/LTS
- -------------------------------------------------------------------------

Package : libarchive Version : 3.4.3-2+deb11u4 CVE ID : CVE-2026-4111 CVE-2026-4424 CVE-2026-4426 CVE-2026-5121 Debian Bug : 1130753 1131444 1131446 1133002

Multiple vulnerabilities have been discovered in libarchive, a multi-format archive and compression C library, which also provides the following command-line tools: bsdcat, bsdcpio, bsdtar and bsdunzip.

CVE-2026-4111

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-2026-4424

A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processing logic due to improper validation of the LZSS sliding window size after transitions between compression methods. A remote attacker can exploit this by providing a specially crafted RAR archive, leading to the disclosure of sensitive heap memory information without requiring authentication or user interaction.

CVE-2026-4426

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-2026-5121

A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.

For Debian 11 bullseye, these problems have been fixed in version 3.4.3-2+deb11u4.

We recommend that you upgrade your libarchive packages.

For the detailed security status of libarchive please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/libarchive

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian 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

Upgrade the libarchive-dev packages.

Plugin Details

Severity: Critical

ID: 312112

File Name: debian_DLA-4563.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 5/5/2026

Updated: 5/5/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-5121

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:libarchive-dev, p-cpe:/a:debian:debian_linux:libarchive13, p-cpe:/a:debian:debian_linux:libarchive-tools

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 5/5/2026

Vulnerability Publication Date: 3/13/2026

Reference Information

CVE: CVE-2026-4111, CVE-2026-4424, CVE-2026-4426, CVE-2026-5121

IAVA: 2026-A-0270

Detections

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