Review reviewCritical

CVE-2026-33466

Elastic Logstash, logstash

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 enabl...

CVSS: 9.8
EPSS: 0.55%
CISA KEV: Not listed
Published: 2026.04.09

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.55%

Technical severityCVSS 9.8

Vulnerability overview

Affected product and versions

Product: Elastic Logstash, logstash
Affected versions: >= 8.0.0 <= 8.19.13, >= 8.0.0 < 8.19.14, >= 9.0.0 < 9.2.8, >= 9.3.0 < 9.3.3
Fixed versions: 8.19.14, 9.2.8, 9.3.3

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Elastic Logstash, logstash and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-22