CVE-2026-14266
Published: July 29th, 2026
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.
HIGH
CVSS v3: 7.8
CVSS v3: 7.8
Status
| DocFilters Release | Package | State | Justification | Comment |
|---|---|---|---|---|
| 26.3 | 7-zip (23.01) | Needs Triage | ||
| 26.2 | 7-zip (23.01) | Needs Triage | ||
| 26.1 | 7-zip (23.01) | Needs Triage | ||
| 25.4 | 7-zip (23.01) | Needs Triage | ||
| 25.3 | 7-zip (23.01) | Needs Triage | ||
| 25.2 | 7-zip (23.01) | Needs Triage | ||
| 25.1 | 7-zip (23.01) | Needs Triage | ||
| 24.4 | 7-zip (23.01) | Needs Triage | ||
| 24.4.0 | 7-zip (23.01) | Needs Triage | ||
| 24.3 | 7-zip (23.01) | Needs Triage | ||
| 24.2 | 7-zip (23.01) | Needs Triage | ||
| 24.1 | 7-zip (23.01) | Needs Triage | ||
| 23.3 | 7-zip (23.01) | Needs Triage | ||
| 23.2 | 7-zip (17.01) | Not Affected | Protected At Runtime | CVE does not included required value ‘lzma’ |
| 23.1 | 7-zip (17.01) | Not Affected | Protected At Runtime | CVE does not included required value ‘lzma’ |
| 22.4 | 7-zip (17.01) | Not Affected | Protected At Runtime | CVE does not included required value ‘lzma’ |
Severity score breakdown
Attack Complexity
LOW
Attack Vector
LOCAL
Availability Impact
HIGH
Base Score
7.8
Base Severity
HIGH
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Privileges Required
NONE
Scope
UNCHANGED
User Interaction
REQUIRED
Vector String
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Version
3.1