What’s Vulnerable › Vulnerabilities

CVE-2026-14266: 7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-29 · updated 2026-08-07
• Weakness: CWE-122

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.

Affected products

• 7-Zip: before 26.02 — fixed in 26.02

How to fix

Upgrade to a fixed version: 7-Zip 26.02. Check the vendor advisory for mitigations.

References

• https://www.zerodayinitiative.com/advisories/ZDI-26-444/
• http://www.openwall.com/lists/oss-security/2026/07/17/12

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