CVE-2026-33466: Improper Limitation of a Pathname to a Restricted Directory in Logstash Leading to Arbitrary File Write
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-33466?
CVE-2026-33466 has a high severity rating due to its potential for arbitrary file write and remote code execution.
How do I fix CVE-2026-33466?
To fix CVE-2026-33466, upgrade to Logstash version 8.19.14 or higher, or any of the patched versions provided by Elastic.
What causes CVE-2026-33466?
CVE-2026-33466 is caused by an improper limitation of a pathname to a restricted directory, allowing relative path traversal.
Which versions of Logstash are affected by CVE-2026-33466?
CVE-2026-33466 affects Elastic Logstash versions from 8.0.0 to 8.19.14, 9.0.0 to 9.2.8, and 9.3.0 to 9.3.3.
What types of attacks can CVE-2026-33466 facilitate?
CVE-2026-33466 can facilitate arbitrary file write and potentially lead to remote code execution on affected systems.