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Incorrect calculation of indentation width in case of mixed tabs and spaces in plistlib · Issue #143346 · python/cpython · GitHub

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Incorrect calculation of indentation width in case of mixed tabs and spaces in plistlib #143346

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Incorrect calculation of indentation width in case of mixed tabs and spaces in plistlib#143346
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3.13only security fixes3.14bugs and security fixes3.15pre-release feature fixes, bugs and security fixesOS-macstdlibStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or error

Description

serhiy-storchaka
opened on Jan 2, 2026

Bug report

There is the indent parameter in plistlib._PlistWriter, which is b'\t' by default. write_bytes() calculates the width of the indentation, but doe it incorrect if the indentation is a mix of tabs and spaces.

Now, there is no public API to specify indent. it is always b'\t', for which an incorrect code works correctly. But if someone uses private plistlib._PlistWriter, they can encounter that bug.

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Activity

  1. serhiy-storchaka
    assigned
    ronaldoussoren
    on Jan 2, 2026
  2. serhiy-storchaka
    added
    type-bugAn unexpected behavior, bug, or error
    OS-mac
    stdlibStandard Library Python modules in the Lib/ directory
    3.13only security fixes
    3.14bugs and security fixes
    3.15pre-release feature fixes, bugs and security fixes
    on Jan 2, 2026
  3. serhiy-storchaka
    added a commit that references this issue on Jan 2, 2026

    pythongh-143346: Fix calculation of the line width for wrapped Base64…

    5be5810

  4. serhiy-storchaka commented on Jan 2, 2026

    serhiy-storchaka
    on Jan 2, 2026
    MemberAuthor

    #143347 fixes the calculation.

    Other way -- just remove the indent parameter and hardcode its value.

  5. serhiy-storchaka
    added a commit that references this issue on Jan 2, 2026

    pythongh-143346: Fix calculation of the line width for wrapped Base64…

    389a103
  6. serhiy-storchaka
    added a commit that references this issue on Jan 12, 2026

    gh-143346: Fix calculation of the line width for wrapped Base64 in pl…

    5f28aa2
  7. miss-islington
    added 2 commits that reference this issue on Jan 12, 2026

    pythongh-143346: Fix calculation of the line width for wrapped Base64…

    2fe821c

    pythongh-143346: Fix calculation of the line width for wrapped Base64…

    77fc4e5
  8. serhiy-storchaka
    closed this as completedon Jan 12, 2026
  9. serhiy-storchaka
    added 2 commits that reference this issue on Jan 12, 2026

    [3.13] gh-143346: Fix calculation of the line width for wrapped Base6…

    8ec1083

    [3.14] gh-143346: Fix calculation of the line width for wrapped Base6…

    6447fa3
  10. reidenong
    added a commit that references this issue on Jan 12, 2026

    pythongh-143346: Fix calculation of the line width for wrapped Base64…

    b7af241
  11. thunder-coding
    added a commit that references this issue on Feb 15, 2026

    pythongh-143346: Fix calculation of the line width for wrapped Base64…

    d386775
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3.13only security fixes3.14bugs and security fixes3.15pre-release feature fixes, bugs and security fixesOS-macstdlibStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or error

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