High severity · published Jul 29, 2026
CVE-2026-14266
7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability
7.8
CVSS
0.7%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 54% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
7Z
7-Zip · 7-Zip
26.01 · source: vendor, NVD
In the news
VulnerabilityHigh
New 7-Zip Vulnerability Could Let Crafted XZ Archives Run Code During Extraction
Opening a crafted XZ archive in 7-Zip could let an attacker run code on the machine. The flaw, CVE-2026-14266, is a heap-based buffer overflow in how the archiver processes XZ chunked data, and Trend Micro's Zero Day Initiative (ZDI) detailed it on July 15. A fix shipped on June 25 in 7-Zip 26.02.
The overflow lets an attacker "execute code in the context of the current process," per the
Jul 20, 2026·The Hacker News
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-14266
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-14266
Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-26-444/
Mailing List
http://www.openwall.com/lists/oss-security/2026/07/17/12
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