Is CVE-2026-14266 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-14266 being exploited in the wild.

How severe is CVE-2026-14266?

High severity, with a CVSS score of 7, published 29 July 2026.

Is there a fix for CVE-2026-14266?

A patch was published on 2026-07-15: Fixed in version 26.02 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-14266 attacked?

It is attacked with local access, in a network appliance.

Am I affected by CVE-2026-14266?

Check whether you run 7-Zip at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-14266: 7-Zip heap overflow in XZ decompression

CVE-2026-14266 · Severity: high · CVSS 7 · Published 2026-07-29

7-Zip is a popular file compression and archiving utility used to manage various file formats. A security flaw in how it handles XZ-compressed files could allow an attacker to take control of a user's computer if the user is tricked into opening a specially crafted malicious file. This could lead to unauthorized access to personal data or the installation of harmful software.

Technologies: 7-Zip. Vendors: 7-Zip.

Quick answers

Is CVE-2026-14266 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-14266 being exploited in the wild.
How severe is CVE-2026-14266?: High severity, with a CVSS score of 7, published 29 July 2026.
Which products and versions are affected?: 7-Zip 26.01.
Is there a fix for CVE-2026-14266?: A patch was published on 2026-07-15: Fixed in version 26.02 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-14266 attacked?: It is attacked with local access, in a network appliance.
Am I affected by CVE-2026-14266?: Check whether you run 7-Zip at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A heap-based buffer overflow vulnerability (CWE-122) exists in 7-Zip within the processing of XZ chunked data. The flaw is triggered during the decompression of specially crafted XZ-compressed data, leading to memory corruption. While categorized with a local attack vector in CVSS, the vulnerability is exploitable if a user opens a malicious file or visits a malicious page (User Interaction required). Successful exploitation allows an attacker to execute arbitrary code in the context of the current process. The issue is fixed in version 26.02.

Affected products

7-Zip 7-Zip 26.01

Timeline

2026-06-05: other: Vulnerability reported to vendor
2026-07-15: advisory: Coordinated public release of advisory by ZDI
2026-07-15: patched: Fixed in version 26.02
2026-07-29: disclosed: NVD publication date

References

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