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CVE-2026-14266 is a remote code execution vulnerability in 7-Zip caused by improper handling of XZ chunked data during archive processing. A specially crafted XZ data stream can trigger a heap-based buffer overflow, resulting in memory corruption while 7-Zip parses the malicious content. Successful exploitation allows attacker-controlled code to execute in the context of the current process. The issue is triggered when a user opens a malicious archive or otherwise causes 7-Zip to process attacker-supplied crafted XZ content, including delivery through a webpage. The flaw was fixed in 7-Zip version 26.02.
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No public exploit code observed for this vulnerability.
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A heap-based buffer overflow in 7-Zip's handling of XZ chunked data that can lead to arbitrary code execution with user interaction.
A heap-based buffer overflow in 7-Zip's processing of XZ chunked data that can lead to remote code execution when a user opens a malicious file or visits a malicious page.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.