CVE-2026-14266highCWE-122

CVE-2026-14266: high-severity vulnerability in 7-Zip

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

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41Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 7epss 0.7%
from disclosure to weaponsame day
Published on NVDJul 29
1st PoCJul 17
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:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected products
7-Zip · 7-Zip
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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