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gh-144133: Add warning about untrusted input to the `idna` codec by StanFromIreland · Pull Request #155475 · python/cpython · GitHub

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gh-144133: Add warning about untrusted input to the idna codec #155475

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Merged
encukou merged 1 commit into from
Sep 15, 2026
Conversation 11 Commits 1 Checks 65 Files changed
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gh-144133: Add warning about untrusted input to the idna codec #155475

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14 changes: 14 additions & 0 deletions Doc/library/codecs.rst
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Expand Up @@ -1395,6 +1395,15 @@ encodings.
| | | :mod:`encodings.idna`. |
| | | Only ``errors='strict'`` |
| | | is supported. |
| | | |
| | | .. warning:: |
| | | |
| | | This codec builds on |
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| | | ``punycode``, whose |
| | | algorithms scale |
| | | poorly, so limit the |
| | | length of untrusted |
| | | input. |
+--------------------+---------+---------------------------+
| mbcs | ansi, | Windows only: Encode the |
| | dbcs | operand according to the |
Expand Down Expand Up @@ -1646,6 +1655,11 @@ Applications) and :rfc:`3492` (Nameprep: A Stringprep Profile for
Internationalized Domain Names (IDN)). It builds upon the ``punycode`` encoding
and :mod:`stringprep`.

.. warning::

This module builds on ``punycode``, whose algorithms scale poorly, so limit
the length of untrusted input.

If you need the IDNA 2008 standard from :rfc:`5891` and :rfc:`5895`, use the
third-party :pypi:`idna` module.

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