What’s Vulnerable › Vulnerabilities
CVE-2026-33466: Improper Limitation of a Pathname to a Restricted Directory in Logstash Leading to Arbitrary File Write
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-08 · updated 2026-07-24
- Weakness: CWE-22
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.
Affected products
- Elastic Logstash: from 8.0.0 before 8.19.14; from 9.0.0 before 9.2.8; from 9.3.0 before 9.3.3 — fixed in 8.19.14, 9.2.8, 9.3.3
How to fix
Upgrade to a fixed version: Elastic Logstash 8.19.14, 9.2.8, 9.3.3. Check the vendor advisory for mitigations.
References
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