Medium [CVE-2026-78254] Arbitrary file write via path traversal in ftp and scp tasks
This medium-severity Red Hat Linux advisory covers CVE-2026-78254 affecting Migration Toolkit for Applications 8, OpenShift Developer Tools and Services, Red Hat build of Apicurio Registry 3.
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Summary
The ftp and scp tasks of Apache Ant can download files from a remote server. A malicious server can provide relative paths that allow it to write outside of the dedicated target directory for the download, making it possible to overwrite files of the attacker's choice using the permissions of the user running Ant in versions prior to Ant 1.10.18.
In order to exploit this vulnerability, the server would either have to be malicious or be subject to a machine-in-the-middle attack. Additionally in the case of scp or the ftp task using ftps the server must pass the server identity checks performed by the tasks.
For ftp tasks not using ftps a malicious server could act as a machine-in-the-middle to provide malicious files. Starting with Ant 1.10.18 both tasks will prevent writing outside of the destination directory by default.
An option is available to disable this behavior in the unlikely case that the old behavior is required by existing build files. Mitigations: Users of scp and ftp (when using ftps) in any version of Ant should not bypass server identity checks.
All users are recommended to upgrade to Apache Ant 1.10.18, which fixes this issue. The ftp and scp tasks, used for downloading files, are vulnerable to a path traversal issue.
- < 1.10.18
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
- 1.10.18
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Mitigation checklist
- To mitigate this vulnerability, users of Apache Ant's `scp` and `ftp` tasks should ensure that server identity checks are not bypassed. For `ftp` tasks not utilizing `ftps`, it is recommended to configure the tasks to use `ftps` to enhance security against machine-in-the-middle attacks.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
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