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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Elastic | Logstash | >= 8.0.0, < 8.19.14 |
Related Weaknesses (CWE)
References
- https://discuss.elastic.co/t/logstash-8-19-14-9-2-8-9-3-3-security-update-esa-20MitigationVendor Advisory
FAQ
What is CVE-2026-33466?
CVE-2026-33466 is a vulnerability with a CVSS score of 8.1 (HIGH). 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 arc...
How severe is CVE-2026-33466?
CVE-2026-33466 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33466?
Check the references section above for vendor advisories and patch information. Affected products include: Elastic Logstash.