CVE-2026-14266
7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability
- Published
- Jul 29, 2026
- Updated
- Jul 30, 2026
- Assigning CNA
- zdi
- Evidence observed
- Aug 15, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HLow · next 30 days
- Percentile
- 52.8%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
4- CVE-2026-14266Exploit
7-Zip XZ Decoder Heap Buffer Overflow - Full analysis, root cause, PoC, and RCE exploitation roadmap
CVE-2026-14266 - XZ Heap Buffer Overflow PoC Generator for 7-Zip
Responsible use
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