Detections
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7-Zip < 26.02 XZ Heap Buffer Overflow RCE (ZDI-26-444)

high Nessus Plugin ID 365301

Synopsis

The remote host is affected by a remote code execution vulnerability.

Description

The version of 7-Zip installed on the remote host is prior to 26.02. It is, therefore, affected by a remote code execution vulnerability as referenced in the ZDI-26-444 advisory.

 - This vulnerability allows remote attackers to execute arbitrary code on affected installations of 7-Zip. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the processing of XZ chunked data. Crafted XZ-compressed data can trigger an overflow of a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. (CVE-2026-14266)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to 7-Zip version 26.02 or later.

See Also

https://www.7-zip.org/history.txt

https://www.zerodayinitiative.com/advisories/ZDI-26-444/

Plugin Details

Severity: High

ID: 365301

File Name: 7zip_26_02.nasl

Version: 1.1

Type: Local

Agent: windows

Family: Windows

Published: 10/13/2026

Updated: 10/13/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.9

Percentile: 99.35

CVSS v2

Risk Factor: High

Base Score: 7.2

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

CVSS Score Source: CVE-2026-14266

CVSS v3

Risk Factor: High

Base Score: 7.8

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

Vulnerability Information

CPE: cpe:/a:7-zip:7-zip

Required KB Items: installed_sw/7-Zip

Patch Publication Date: 6/25/2026

Vulnerability Publication Date: 7/15/2026

Reference Information

CVE: CVE-2026-14266

CWE: 122