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CVE-2026-33466— Improper Limitation of a Pathname to a Restricted Directory in Logstash Leading to Arbitrary File Write

Quick assessment

Affected
Elastic Logstash
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Elastic Logstash是荷兰Elastic公司的一套日志分析和监控工具。 Elastic Logstash存在安全漏洞，该漏洞源于路径限制不当，可能导致任意文件写入和远程代码执行。

CVSS 8.1 · High EPSS 0.85% · P56
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I. Basic Information for CVE-2026-33466

Vulnerability Information
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Vulnerability Title
Improper Limitation of a Pathname to a Restricted Directory in Logstash Leading to Arbitrary File Write
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Limitation of a Pathname to a Restricted Directory (CWE-22) in Logstash can lead to arbitrary file write and potentially remote code execution via Relative Path Traversal (CAPEC-139). The archive extraction utilities used by Logstash do not properly validate file paths within compressed archives. An attacker who can serve a specially crafted archive to Logstash through a compromised or attacker-controlled update endpoint can write arbitrary files to the host filesystem with the privileges of the Logstash process. In certain configurations where automatic pipeline reloading is enabled, this can be escalated to remote code execution.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Elastic Logstash 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Elastic Logstash是荷兰Elastic公司的一套日志分析和监控工具。 Elastic Logstash存在安全漏洞，该漏洞源于路径限制不当，可能导致任意文件写入和远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Elastic Logstash 8.0.0 ~ 8.19.13 -

II. Public POCs for CVE-2026-33466

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III. Intelligence Information for CVE-2026-33466

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Vendor Advisories for CVE-2026-33466 (1)

Same Patch Batch · Elastic · 2026-04-08 · 6 CVEs total

CVE-2026-4498 7.7 HIGH Execution with Unnecessary Privileges in Kibana Leading to reading index data beyond their
CVE-2026-33461 7.7 HIGH Incorrect Authorization in Kibana Fleet Leading to Information Disclosure
CVE-2026-33458 6.8 MEDIUM Server-Side Request Forgery (SSRF) in Kibana One Workflow Leading to Information Disclosur
CVE-2026-33459 6.5 MEDIUM Uncontrolled Resource Consumption in Kibana Leading to Denial of Service
CVE-2026-33460 4.3 MEDIUM Incorrect Authorization in Kibana Fleet Leading to Information Disclosure

IV. Related Vulnerabilities

Same product: Logstash
Same vendor: Elastic
Same weakness: CWE-22

V. Comments for CVE-2026-33466

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