CVE-2026-14266: 7-Zip

High severity, CVSS 7.8. EPSS: 0.7% chance of exploitation in the next 30 days.

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: before 26.02 (fixed in 26.02)

Published 2026-07-29. Last modified 2026-08-07.