Relative Path Traversal Affecting org.apache.ant:ant package, versions [,1.10.18)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published9 Sept 2026
- disclosed7 Sept 2026
- creditUnknown
Introduced: 7 Sep 2026
NewCVE-2026-78254 (opens in a new tab)How to fix?
Upgrade org.apache.ant:ant to version 1.10.18 or higher.
Overview
org.apache.ant:ant is a software tool for automating software build processes which originated from the Apache Tomcat project in early 2000.
Affected versions of this package are vulnerable to Relative Path Traversal through the file retrieval logic in FTPTask, FTPTaskMirrorImpl, ScpFromMessage, and ScpFromMessageBySftp. An attacker controlling the remote server, or a man-in-the-middle for non-FTPS FTP, can supply filenames or directory entries with relative path components that make Ant write outside the intended destination directory, allowing arbitrary file overwrite with the privileges of the user running Ant.
Workarounds
- Do not bypass server identity checks when using
scporftpwithftps; only download from servers whose identity you verify, to reduce the chance of a malicious or man-in-the-middle server supplying path-traversal filenames. - For
ftptransfers that are not usingftps, switch toftpswhere possible, to prevent a man-in-the-middle from tampering with the server’s file names or directory entries during download.