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url2pathname() mishandles URL with Windows drive in netloc #137059

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url2pathname() mishandles URL with Windows drive in netloc#137059
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stdlibStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or error

Description

@barneygale
barneygale
opened on Jul 23, 2025

Bug report

Bug description:

Windows-specific regression in Python 3.14 caused by d783d7b

Some programs generate file URLs by adding a file:// prefix to a path. On Windows, this can result in URLs like file://C:/foo. Though these URLs are malformed, they were correctly handled by urllib.request.url2pathname() until 3.14.

>>> from urllib.request import url2pathname
>>> url2pathname('//C:/foo')
'\\\\C:\\foo'  # expected 'C:\\foo'

CPython versions tested on:

3.14

Operating systems tested on:

No response

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Activity

  1. barneygale
    added
    type-bugAn unexpected behavior, bug, or error
    stdlibStandard Library Python modules in the Lib/ directory
    on Jul 23, 2025
  2. barneygale
    changed the title [-]`url2pathname()` mishandles URLs with Windows drive in netloc[/-] [+]`url2pathname()` mishandles URL with Windows drive in netloc[/+] on Jul 23, 2025
  3. barneygale
    added a commit that references this issue on Jul 23, 2025

    pythonGH-137059: `url2pathname()`: fix support for drive letter in ne…

    ff3dc92

  4. serhiy-storchaka commented on Jul 24, 2025

    @serhiy-storchaka
    serhiy-storchaka
    on Jul 24, 2025
    Member

    Note that there will also be issues if the path contains # (after #136874) or %. On Posix -- also if the path contains ?.

  5. barneygale
    added a commit that references this issue on Jul 27, 2025

    GH-137059: `url2pathname()`: fix support for drive letter in netloc (#…

    10a925c
  6. miss-islington
    added a commit that references this issue on Jul 27, 2025

    pythonGH-137059: `url2pathname()`: fix support for drive letter in ne…

    a48d1ec
  7. hugovk
    added a commit that references this issue on Jul 28, 2025

    [3.14] GH-137059: `url2pathname()`: fix support for drive letter in n…

    aeb55eb
  8. hugovk
    closed this as completedon Aug 11, 2025
  9. Agent-Hellboy
    added a commit that references this issue on Aug 19, 2025

    pythonGH-137059: `url2pathname()`: fix support for drive letter in ne…

    48a40a2
  10. kumaraditya303
    added a commit that references this issue on Sep 9, 2025

    [3.14] pythonGH-137059: `url2pathname()`: fix support for drive lette…

    3a989f9
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