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[3.12] gh-139400: Make sure that parent parsers outlive their subparsers in pyexpat (GH-139403)#139609

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ambv merged 2 commits into
python:3.12python/cpython:3.12from
hartwork:backport-6edb2dd-3.12hartwork/cpython:backport-6edb2dd-3.12Copy head branch name to clipboard
Oct 7, 2025
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[3.12] gh-139400: Make sure that parent parsers outlive their subparsers in pyexpat (GH-139403)#139609
ambv merged 2 commits into
python:3.12python/cpython:3.12from
hartwork:backport-6edb2dd-3.12hartwork/cpython:backport-6edb2dd-3.12Copy head branch name to clipboard

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@hartwork

@hartwork hartwork commented Oct 5, 2025

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…rs in `pyexpat` (python#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 6edb2dd)
@hartwork hartwork changed the title [3.12] gh-139400: Make sure that parent parsers outlive their subparsers in pyexpat (GH-139403) [3.12] gh-139400: Make sure that parent parsers outlive their subparsers in pyexpat (GH-139403) Oct 5, 2025
@picnixz picnixz assigned pablogsal and Yhg1s and unassigned pablogsal Oct 6, 2025
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picnixz commented Oct 6, 2025

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(Sorry for the misassignments; I got lost in my multiple tabs & backport versions :))

@ambv ambv merged commit dea7e3d into python:3.12 Oct 7, 2025
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