CVE-2025-27553

Description

Relative Path Traversal vulnerability in Apache Commons VFS before 2.10.0. The FileObject API in Commons VFS has a 'resolveFile' method that takes a 'scope' parameter. Specifying 'NameScope.DESCENDENT' promises that "an exception is thrown if the resolved file is not a descendent of the base file". However, when the path contains encoded ".." characters (for example, "%2E%2E/bar.txt"), it might return file objects that are not a descendent of the base file, without throwing an exception. This issue affects Apache Commons VFS: before 2.10.0. Users are recommended to upgrade to version 2.10.0, which fixes the issue.

How to fix CVE-2025-27553

To remediate CVE-2025-27553, upgrade the affected package to a fixed version below.

—upgrade to 2.1-2+deb11u1 or later
—upgrade to 2.1-2+deb11u1 or later
—upgrade to 2.10.0 or later

Is CVE-2025-27553 being exploited?

Low — EPSS is 0.7%, meaning exploitation activity has not been observed at scale.

Affected packages (3)

from 0, < 2.1-2+deb11u1
from 0, < 2.1-2+deb11u1
from 0, < 2.10.0

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	HIGH7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N