---
id: CVE-2026-14266
title: >-
  7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution
  Vulnerability
summary: >-
  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 …
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-122
vendor: 7-zip
product: 7-zip
affected:
  - 7-zip < 26.02
patched:
  - 7-zip 26.02
published: '2026-07-29'
updated: '2026-08-07'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-14266'
references:
  - url: 'https://www.zerodayinitiative.com/advisories/ZDI-26-444/'
    label: zdi-disclosures@trendmicro.com
  - url: 'http://www.openwall.com/lists/oss-security/2026/07/17/12'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - exploit-available
epss: 0.00742
epssPercentile: 0.52734
zeroDay: true
ingestedAt: '2026-08-08T13:22:52.486Z'
exploits:
  github: 3
  githubRepos:
    - 'https://github.com/4minx/CVE-2026-14266'
    - 'https://github.com/liyuxuan504-byte/CVE-2026-14266'
    - 'https://github.com/ret2bilibili/CVE-2026-14266'
  checkedAt: '2026-09-26T09:05:37.960Z'
exploitAvailable: true
---

## Overview

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.

## Affected

- `7-zip < 26.02`

## Remediation

Upgrade past the affected range:

- `7-zip 26.02`