Debian dla-4719 : p7zip - security update

medium Nessus Plugin ID 332780

Synopsis

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

Description

The remote Debian 11 / 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4719 advisory.

- ------------------------------------------------------------------------- Debian LTS Advisory DLA-4719-1 [email protected] https://www.debian.org/lts/security/ Sylvain Beucler August 05, 2026 https://wiki.debian.org/LTS
- -------------------------------------------------------------------------

Package : p7zip Version : 16.02+really26.02+dfsg-0+deb11u1 16.02+really26.02+dfsg-0+deb12u1 CVE ID : CVE-2026-14266 CVE-2026-58052 Debian Bug : 1142293

Multiple vulnerabilities were discovered in p7zip, a now unmaintained fork of 7-Zip, which itself is a file archiver handling multiple formats.

To address these security vulnerabilities, whose fixes unfortunately cannot be isolated, this update again replaces p7zip with a recent 7-Zip (now v26.02), slightly modified to make it reasonably compatible with p7zip.

Among the fixed vulnerabilities, the following were made public:

CVE-2026-14266

XZ decompression heap-based buffer overflow, potentially leading to remote code execution.

CVE-2026-58052

RAR5 alternate-stream handling issue, when running on an NTFS filesystem with transparent ADS (Alternate Data Stream) and ADS canonicalization, letting an attacker defeat Mark-of-the-Web warnings and spoof file content.

For Debian 11 bullseye, these problems have been fixed in version 16.02+really26.02+dfsg-0+deb11u1.

For Debian 12 bookworm, these problems have been fixed in version 16.02+really26.02+dfsg-0+deb12u1.

We recommend that you upgrade your p7zip packages.

For the detailed security status of p7zip please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/p7zip

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 p7zip packages.

Plugin Details

Severity: Medium

ID: 332780

File Name: debian_DLA-4719.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 8/5/2026

Updated: 8/5/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.9

Percentile: 99.35

CVSS v2

Risk Factor: Medium

Base Score: 6.2

Temporal Score: 4.9

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

CVSS Score Source: CVE-2026-14266

CVSS v3

Risk Factor: High

Base Score: 7

Temporal Score: 6.3

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

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

CVSS v4

Risk Factor: Medium

Base Score: 4.8

Threat Score: 1.9

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2026-58052

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:debian:debian_linux:p7zip-full, p-cpe:/a:debian:debian_linux:p7zip

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/5/2026

Vulnerability Publication Date: 6/28/2026

Reference Information

CVE: CVE-2026-14266, CVE-2026-58052

Detections

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