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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 的 和 任务可以从远程服务器下载文件。在 Ant 1.10.18 之前的版本中，恶意服务器可以提供相对路径，使其能够突破专门用于下载的目录范围进行写入，从而利用运行 Ant 的用户权限覆盖攻击者选择的文件。 要利用此漏洞，服务器必须是恶意的，或者遭受中间人攻击。此外，在使用 或 任务（使用 FTPS 时），服务器必须通过任务执行的服务器身份验证。 对于未使用 FTPS 的 任务，恶意服务器可以作为中间人提供恶意文件。 从 Ant 1.10.18 版本开始，这两个任务默认都会防止在目标目录之外写

AI Predicted 7.3 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1195 · Supply Chain Compromise
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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

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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