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CVE-2026-78254— Apache Ant: Path traversal in ftp and scp tasks allows arbitrary file write

Quick assessment

Affected
Apache Software Foundation Apache Ant
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Ant是美国Apache基金会的一款自动化构建工具。 Apache Ant 1.10.18之前版本存在路径遍历漏洞，该漏洞源于ftp和scp任务下载文件时路径处理不当，恶意服务器可通过相对路径将文件写入专用目标目录之外，从而覆盖攻击者选择的文件。

AI Predicted 7.3 Difficulty: Moderate EPSS 0.52% · P43

Possible ATT&CK Techniques 1 AI

T1195 · Supply Chain Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apache Software Foundation Apache Ant 1.2< 1.10.18 affected
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I. Basic Information for CVE-2026-78254

Vulnerability Information
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Vulnerability Title
Apache Ant: Path traversal in ftp and scp tasks allows arbitrary file write
Source: CVE Program / CVE List V5
Vulnerability Description
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. Users of ftp not using ftps should switch to ftps where possible. All users are recommended to upgrade to Apache Ant 1.10.18, which fixes this issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
相对路径遍历
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Ant 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Ant是美国Apache基金会的一款自动化构建工具。 Apache Ant 1.10.18之前版本存在路径遍历漏洞，该漏洞源于ftp和scp任务下载文件时路径处理不当，恶意服务器可通过相对路径将文件写入专用目标目录之外，从而覆盖攻击者选择的文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Ant 1.2 ~ 1.10.18 -

II. Public POCs for CVE-2026-78254

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III. Intelligence Information for CVE-2026-78254

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Mailing List Discussions for CVE-2026-78254 (1)

IV. Related Vulnerabilities

Same product: Apache Ant
Same vendor: Apache Software Foundation
Same weakness: CWE-23

V. Comments for CVE-2026-78254

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