CWE-42Variant

Path Equivalence: 'filename.' (Trailing Dot)

Incomplete in the CWE catalog · 1 CVE mapped

1
CVEs mapped
7.8
Median CVSS
What it is

The product accepts path input in the form of trailing dot ('filedir.') without appropriate validation, which can lead to ambiguous path resolution and allow an attacker to traverse the file system to unintended locations or access arbitrary files.

Recent examples
7.8cvss
CVE-2026-52884

Notepad++: CVE-2026-48800 Bypass

Notepad++ is a free and open-source source code editor. In v8.9.6.1, isInTrustedDirectory() does NOT canonicalize the path before checking. It uses a prefix-based check (PathIsPrefix() or equivalent) that matches paths starting with trusted directory strings. A path traversal using ..\..\ after a trusted directory prefix passes the check while resolving to an untrusted location. The CVE-2026-48800 patch adds isInTrustedDirectory() validation in Command::run() (RunDlg.cpp) before calling ShellExecute(). This function checks whether the resolved executable path is under a trusted directory. This vulnerability is fixed in 8.9.6.2.

HIGHno explanation yet
0%
epss
The record
Technical detail
CWE ID
CWE-42
Abstraction
Variant
Structure
Simple
Status
Incomplete