CWE-29: Path Traversal: '\..\filename'


The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize '\..\filename' (leading backslash dot dot) sequences that can resolve to a location that is outside of that directory.

Submission Date :

July 19, 2006, midnight

Modification Date :

2023-06-29 00:00:00+00:00

Organization :

Extended Description

This allows attackers to traverse the file system to access files or directories that are outside of the restricted directory.

This is similar to CWE-25, except using "\" instead of "/". Sometimes a program checks for "..\" at the beginning of the input, so a "\..\" can bypass that check. It is also useful for bypassing path traversal protection schemes that only assume that the "/" separator is valid.

Related Weaknesses

This table shows the weaknesses and high level categories that are related to this weakness. These relationships are defined to give an overview of the different insight to similar items that may exist at higher and lower levels of abstraction.

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