Bug 2508503 (CVE-2026-14266)

Summary: CVE-2026-14266 7-Zip: 7-Zip: Remote Code Execution via XZ decompression heap-based buffer overflow
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in 7-Zip. This vulnerability allows a remote attacker to execute arbitrary code on affected installations. Exploitation requires user interaction, such as opening a specially crafted malicious file or visiting a malicious web page. The flaw occurs during the processing of XZ-compressed data, where specially crafted input can lead to a heap-based buffer overflow, enabling the attacker to run unauthorized code.
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Bug Depends On: 2509211, 2509212    
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Description OSIDB Bzimport 2026-07-29 18:01:27 UTC 
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.