cpython/Misc/NEWS.d/next/Security/2025-09-29-00-01-28.gh-issue-139400.X2T-jO.rst
Sebastian Pipping 8ea678d6d1
[3.10] gh-139400: Make sure that parent parsers outlive their subparsers in pyexpat (GH-139403) (#139613)
* gh-139400: Make sure that parent parsers outlive their subparsers in `pyexpat` (#139403)

* Modules/pyexpat.c: Disallow collection of in-use parent parsers.

Within libexpat, a parser created via `XML_ExternalEntityParserCreate`
is relying on its parent parser throughout its entire lifetime.
Prior to this fix, is was possible for the parent parser to be
garbage-collected too early.

(cherry picked from commit 6edb2ddb5f)

* Move news item to from section "Core and Builtins" to section "Security"
2025-10-07 00:34:14 +01:00

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:mod:`xml.parsers.expat`: Make sure that parent Expat parsers are only
garbage-collected once they are no longer referenced by subparsers created
by :meth:`~xml.parsers.expat.xmlparser.ExternalEntityParserCreate`.
Patch by Sebastian Pipping.