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.

CVSS v3.1

7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.0

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

EPSS

0.74% chance of exploitation in the next 30 days, 52th percentile

Published

2026-07-29

Updated

2026-07-30

Proof-of-concept exploits (2)

• 4minx/CVE-2026-142663★ · 2026-08-15
• hg0434hongzh0/CVE-2026-142660★ · 2026-07-17

References

• CVE Record
• NVD entry

Related

• CVE-2024-8682
• CVE-2026-50522
• CVE-2026-60137
• CVE-2026-63030
• CVE-2026-64638
• CVE-2026-72898