# CVE-2026-33466: Improper Limitation of a Pathname to a Restricted Directory in Logstash Leading to Arbitrary File Write

> CVE-2026-33466: Improper Limitation of a Pathname to a Restricted Directory in Logstash Leading to Arbitrary File Write. CVSS 8.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-33466
Last updated: 2026-07-24T23:10:00Z

- Published: 2026-04-08 16:50 UTC · Updated: 2026-07-24 23:10 UTC · Assigner: elastic
- CVSS: 8.1 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 0.55%, 45th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: 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 vendors and products

- Elastic: Logstash

## Tracked companies

- [Elastic Cloud](https://rewindex.com/company/elastic-cloud.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-33466)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-33466)
- [https://discuss.elastic.co/t/logstash-8-19-14-9-2-8-9-3-3-security-update-esa-2026-29/385816](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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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-33466 · Markdown: https://rewindex.com/cve/CVE-2026-33466.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-33466 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:10:57.835Z