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https://issues.apache.org/jira/browse/IO-559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16299980#comment-16299980
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Stefan Bodewig commented on IO-559:
-----------------------------------
The pull request has become bigger than I expected as I needed to add
verification of IP numbers as well. I'm not 100% sure about percent encoded
hostnames or hostnames containing non-ASCII characters, so would prefer a
second pair of eyes.
> FilenameUtils.normalize should verify hostname syntax in UNC path
> -----------------------------------------------------------------
>
> Key: IO-559
> URL: https://issues.apache.org/jira/browse/IO-559
> Project: Commons IO
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 2.6
> Reporter: Stefan Bodewig
>
> {{FilenameUtils.normalize}} will accept broken file names as UNC path even if
> their hostname part doesn't match the syntax of a proper hostname. Using
> certain hostnames like "." this may lead to strange side effects.
> Most likely the best fix will be to make {{getPrefixLength}} verify the
> hostname part of a suspected UNC path and return a value of {{NOT_FOUND}} if
> it is not a valid hostname - much like it does for triple slashes.
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