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New 7-Zip Vulnerability Could Let Crafted XZ Archives Run Code During Extraction

The Hacker News

July 20, 2026 at 9:10 AM

Overview

A newly discovered vulnerability in 7-Zip, identified as CVE-2026-14266, could allow attackers to execute arbitrary code on a user's machine when they open a specially crafted XZ archive. This security flaw stems from a heap-based buffer overflow that occurs during the processing of XZ chunked data. The issue was detailed by Trend Micro's Zero Day Initiative on July 15, but a fix was already released on June 25 with version 26.02 of 7-Zip. Users of 7-Zip should update to this latest version to protect themselves from potential exploitation. The vulnerability poses a serious risk, as it can run code in the context of the current process, making it a significant concern for anyone using the software.

Key Takeaways

Affected Systems: 7-Zip versions prior to 26.02
Action Required: Users should update to 7-Zip version 26.
Timeline: Disclosed on July 15, 2023

Original Article Summary

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

Impact

7-Zip versions prior to 26.02

Exploitation Status

No active exploitation has been reported at this time. However, organizations should still apply patches promptly as proof-of-concept code may exist.

Timeline

Disclosed on July 15, 2023

Remediation

Users should update to 7-Zip version 26.02 or later to mitigate the vulnerability.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to CVE, Vulnerability, Update, and 1 more.

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