Vulnerability details

CVE-2026-33466

Elastic Logstash

Improper Limitation of a Pathname to a Restricted Directory in Logstash Leading to Arbitrary File Write

CVSS 3.1

8.1High

Official 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 scores

Score	Version	Source	Vector
8.1High	3.1	CVEProject cvelistV5 (CNA) (elastic)	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
Elastic	Logstash	8.0.0 ≤ v ≤ 8.19.13	CVEProject cvelistV5 (CNA)

References and advisories

https://discuss.elastic.co/t/logstash-8-19-14-9-2-8-9-3-3-security-update-esa-2026-29/385816

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Details

Published: 2026-04-08
Last updated: 2026-04-10
State: Published
Assigner (CNA): elastic

Exploit prediction (EPSS)

0.55%

Probability of exploitation in 30 days

46.5%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-22
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')