Elastic Logstash up to 8.19.13 Archive path traversal

Summaryinfo

A vulnerability, which was classified as critical, has been found in Elastic Logstash up to 8.19.13. Affected by this vulnerability is an unknown functionality of the component Archive Handler. Performing a manipulation results in path traversal. This vulnerability is identified as CVE-2026-33466. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical has been found in Elastic Logstash up to 8.19.13. This affects an unknown functionality of the component Archive Handler. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at discuss.elastic.co. This vulnerability is uniquely identified as CVE-2026-33466 since 03/20/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/10/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 305951 (Logstash 8.x < 8.19.14 / 9.x < 9.2.8 / 9.3.x < 9.3.3 Path Traversal (ESA-2026-29)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (305951). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• Elastic

Name

• Logstash

Version

• 8.19.0
• 8.19.1
• 8.19.2
• 8.19.3
• 8.19.4
• 8.19.5
• 8.19.6
• 8.19.7
• 8.19.8
• 8.19.9
• 8.19.10
• 8.19.11
• 8.19.12
• 8.19.13

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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