CVE-2026-14266

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.

Affected products

7-Zip

7-zip

< 26.02

Fix

Available

CVSS 3.1

7.8 HIGH

EPSS

0.9% (58th percentile)

Weakness

CWE-122

NVD status

Analyzed

Published

2026-07-29