Vulnerability Report

CVE-2026-14266

RCE

Title: 7-Zip XZ Decompression Heap Buffer Overflow RCE

Memory Corruption

Proof Of Concept

PoC Available for CVE-2026-14266

CWE Category CWE-122

Published Date Jul 29, 2026

Modified Date Aug 07, 2026

Exploit Status Available

Score 7.8 CVSS v3.0

Exploit Probability (EPSS)

0.94%

Vulnerability Summary

CVE-2026-14266: 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.

Impacted Vendors

7-zip 1

Reference Links

https://www.zerodayinitiative.com/advisories/ZDI-26-444/ http://www.openwall.com/lists/oss-security/2026/07/17/12

CVSS v3.1

Source Entity [email protected]

Severity HIGH

7.8

Attack Vector

LOCAL

Complexity

LOW

Privileges

N/A

Interaction

REQUIRED

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.0

Source Entity [email protected]

Severity HIGH

7.0

Attack Vector

LOCAL

Complexity

HIGH

Privileges

N/A

Interaction

REQUIRED

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-14266 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/4minx/CVE-2026-14266

View Code

GitHub https://github.com/liyuxuan504-byte/CVE-2026-14266

View Code

GitHub https://github.com/hg0434hongzh0/CVE-2026-14266

View Code

August 07, 2026 MODIFIED