7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-14266
StatePUBLISHED
Assignerzdi
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-29 18:16:50 UTC
Updated2026-07-29 19:16:44 UTC
Description7-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.

Risk And Classification

Primary CVSS: v3.0 7 HIGH from [email protected]

CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Problem Types: CWE-122 | CWE-122 CWE-122: Heap-based Buffer Overflow

VersionSourceTypeScoreSeverityVector
3.0[email protected]Secondary7HIGHCVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
3.0CNACVSS7HIGHCVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.0 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA 7-Zip 7-Zip affected 26.01 Not specified

References

ReferenceSourceLinkTags
www.zerodayinitiative.com/advisories/ZDI-26-444 [email protected] www.zerodayinitiative.com
www.openwall.com/lists/oss-security/2026/07/17/12 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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