Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| 7-Zip | 7-Zip | < 26.02 |
Related Weaknesses (CWE)
References
- https://www.zerodayinitiative.com/advisories/ZDI-26-444/Third Party AdvisoryVDB Entry
- http://www.openwall.com/lists/oss-security/2026/07/17/12Mailing ListThird Party Advisory
FAQ
What is CVE-2026-14266?
CVE-2026-14266 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 int...
How severe is CVE-2026-14266?
CVE-2026-14266 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-14266?
Check the references section above for vendor advisories and patch information. Affected products include: 7-Zip 7-Zip.