CVE-2026-33466
HighCVSS 8.1Exploitation Probability (EPSS)
Low risk42th percentile - higher than 42% of all known CVEs
Summary
Logstash contains a path traversal vulnerability (CWE-22) in archive extraction utilities. An attacker can supply a crafted archive, allowing arbitrary file write with Logstash process privileges. In configurations with automatic pipeline reloading, this can lead to remote code execution.
Risk Assessment
An attacker can write malicious files to the server, potentially leading to full compromise of the Logstash system.
Recommendation
Update Logstash to a patched version and disable automatic pipeline reloading if not required.
Other vulnerabilities in Logstash
See all- CVE-2015-5378High
Logstash versions 1.5.x before 1.5.3 and 1.4.x before 1.4.4 allow remote attackers to read communications between Logstash Forwarder agent and Logstash server.
- CVE-2016-10363High
Logstash versions prior to 2.3.3, when using the Netflow Codec plugin, are vulnerable to denial of service attacks. A remote attacker can exploit crafted Netflow v5, Netflow v9, or IPFIX packets, causing the Logstash process to crash.
- CVE-2016-1000222High
Logstash versions prior to 2.1.2 are vulnerable to attacks via engineered input that can create malicious formulas in CSV data.
Original NVD description (English source)
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.