7-Zip 26.02 patches RCE flaw triggered by malicious XZ archives

7-Zip version 26.02 addresses a remote code execution vulnerability tracked as CVE-2026-14266 that stems from a heap-based buffer overflow when processing specially crafted XZ-compressed data. An attacker can trigger the flaw if a user opens a malicious archive or visits a page delivering a crafted XZ payload, allowing arbitrary code to run with the privileges of the logged-in user. The issue was disclosed by researcher Landon Peng and detailed in a Zero Day Initiative advisory, with the patch adding checks to prevent the decoder from writing beyond available buffer space. Source

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