CVE-2026-14266

7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability

Published Jul 29, 2026 CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Description
7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability. 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. Was ZDI-CAN-30169.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Debian DLA Debian DLA DLA-4718-1 7zip security update
Debian DLA Debian DLA DLA-4719-1 p7zip security update
History
Type Values Removed Values Added
First Time appeared 7-zip
7-zip 7-zip
Vendors & Products 7-zip
7-zip 7-zip
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability. 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. Was ZDI-CAN-30169.
Title 7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability
Weaknesses CWE-122
References
Metrics cvssV3_0

{'score': 7, 'vector': 'CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
zdi
Published
Updated
Jul 30, 2026, 3:55 AM
Reserved
Jun 30, 2026, 6:43 PM
Status
Analyzed
Published
Jul 29, 2026, 6:16 PM
Modified
Aug 7, 2026, 8:48 PM