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gh-90949: Recommend `hasattr` with Expat security methods by hartwork · Pull Request #139800 · python/cpython · GitHub

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gh-90949: Recommend hasattr with Expat security methods #139800

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Merged
hugovk merged 9 commits into from
Oct 14, 2025
Conversation 26 Commits 9 Checks 29 Files changed
Merged

gh-90949: Recommend hasattr with Expat security methods #139800

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834a7e0
Doc/library/pyexpat.rst: Recommend "hasattr" with Expat security methods
hartwork Oct 8, 2025
828f786
Doc/library/pyexpat.rst: Use ".. note::" with SetReparseDeferralEnabled
hartwork Oct 8, 2025
c932512
Doc/library/xml.etree.elementtree.rst: Use ".. note::" for backport n…
hartwork Oct 8, 2025
32d51e3
Doc/library/xml.etree.elementtree.rst: Add missing indent by 3
hartwork Oct 8, 2025
67b5221
Add an exclemation mark to suppress distracting links
hartwork Oct 9, 2025
5014423
Demo more quiet version without ".. note::"
hartwork Oct 9, 2025
a4f79ad
Revert accidental addition of blank line
hartwork Oct 13, 2025
d5ecaa2
Drop "Note that " at the start of the sentence
hartwork Oct 13, 2025
6e397c4
Resolve double self reference
hartwork Oct 13, 2025
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28 changes: 24 additions & 4 deletions Doc/library/pyexpat.rst
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Expand Up @@ -223,10 +223,10 @@ XMLParser Objects
Calling ``SetReparseDeferralEnabled(True)`` allows re-enabling reparse
deferral.

Note that :meth:`SetReparseDeferralEnabled` has been backported to some
prior releases of CPython as a security fix. Check for availability of
:meth:`SetReparseDeferralEnabled` using :func:`hasattr` if used in code
running across a variety of Python versions.
:meth:`!SetReparseDeferralEnabled`
has been backported to some prior releases of CPython as a security fix.
Check for availability using :func:`hasattr` if used in code running
across a variety of Python versions.

.. versionadded:: 3.13

Expand Down Expand Up @@ -257,6 +257,11 @@ against some common XML vulnerabilities.
The corresponding :attr:`~ExpatError.lineno` and :attr:`~ExpatError.offset`
should not be used as they may have no special meaning.

:meth:`!SetBillionLaughsAttackProtectionActivationThreshold`
has been backported to some prior releases of CPython as a security fix.
Check for availability using :func:`hasattr` if used in code running
across a variety of Python versions.

.. note::

Activation thresholds below 4 MiB are known to break support for DITA 1.3
Expand Down Expand Up @@ -288,6 +293,11 @@ against some common XML vulnerabilities.
The corresponding :attr:`~ExpatError.lineno` and :attr:`~ExpatError.offset`
should not be used as they may have no special meaning.

:meth:`!SetBillionLaughsAttackProtectionMaximumAmplification`
has been backported to some prior releases of CPython as a security fix.
Check for availability using :func:`hasattr` if used in code running
across a variety of Python versions.

.. note::

The maximum amplification factor is only considered if the threshold
Expand All @@ -309,6 +319,11 @@ against some common XML vulnerabilities.
The corresponding :attr:`~ExpatError.lineno` and :attr:`~ExpatError.offset`
should not be used as they may have no special meaning.

:meth:`!SetAllocTrackerActivationThreshold`
has been backported to some prior releases of CPython as a security fix.
Check for availability using :func:`hasattr` if used in code running
across a variety of Python versions.

.. versionadded:: next

.. method:: xmlparser.SetAllocTrackerMaximumAmplification(max_factor, /)
Expand All @@ -334,6 +349,11 @@ against some common XML vulnerabilities.
The corresponding :attr:`~ExpatError.lineno` and :attr:`~ExpatError.offset`
should not be used as they may have no special meaning.

:meth:`!SetAllocTrackerMaximumAmplification`
has been backported to some prior releases of CPython as a security fix.
Check for availability using :func:`hasattr` if used in code running
across a variety of Python versions.

.. note::

The maximum amplification factor is only considered if the threshold
Expand Down
16 changes: 8 additions & 8 deletions Doc/library/xml.etree.elementtree.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1398,10 +1398,10 @@ XMLParser Objects
Disabling reparse deferral has security consequences; please see
:meth:`xml.parsers.expat.xmlparser.SetReparseDeferralEnabled` for details.

Note that :meth:`flush` has been backported to some prior releases of
CPython as a security fix. Check for availability of :meth:`flush`
using :func:`hasattr` if used in code running across a variety of Python
versions.
:meth:`!flush`
has been backported to some prior releases of CPython as a security fix.
Check for availability using :func:`hasattr` if used in code running
across a variety of Python versions.

.. versionadded:: 3.13

Expand Down Expand Up @@ -1476,10 +1476,10 @@ XMLPullParser Objects
Disabling reparse deferral has security consequences; please see
:meth:`xml.parsers.expat.xmlparser.SetReparseDeferralEnabled` for details.

Note that :meth:`flush` has been backported to some prior releases of
CPython as a security fix. Check for availability of :meth:`flush`
using :func:`hasattr` if used in code running across a variety of Python
versions.
:meth:`!flush`
has been backported to some prior releases of CPython as a security fix.
Check for availability using :func:`hasattr` if used in code running
across a variety of Python versions.

.. versionadded:: 3.13

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