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GeezerVison is showing github.com — [3.12] gh-149018: Use `XML_SetHashSalt16Bytes` in `pyexpat`/`_elementtree` when possible (GH-149023) by StanFromIreland · Pull Request #155345 · python/cpython

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@StanFromIreland

@StanFromIreland StanFromIreland commented Aug 7, 2026 •
edited by bedevere-app Bot
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(cherry picked from commit fc9b11f)

(cherry picked from commit 24b8f12)

  • Issue: [CVE-2026-7210] Insufficient entropy in pyexpat with protection against hash flooding #149018

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@StanFromIreland
[3.12] pythongh-149018: Use XML_SetHashSalt16Bytes in pyexpat/`_e…
2dbcc53 
…lementtree` when possible (pythonGH-149023)

(cherry picked from commit fc9b11f)

Co-authored-by: Stan Ulbrych <[email protected]>
(cherry picked from commit 24b8f12)
@StanFromIreland StanFromIreland assigned Yhg1s Aug 7, 2026
@StanFromIreland
StanFromIreland requested a review from tiran as a code owner August 7, 2026 14:13
This was referenced Aug 7, 2026
[CVE-2026-7210] Insufficient entropy in pyexpat with protection against hash flooding #149018
Closed
gh-149018: Use XML_SetHashSalt16Bytes in pyexpat/_elementtree when possible #149023
Merged
@bedevere-app bedevere-app Bot added the awaiting core review label Aug 7, 2026
@StanFromIreland StanFromIreland added needs backport to 3.10 needs backport to 3.11 only security fixes labels Aug 10, 2026
@Yhg1s
Yhg1s merged commit e37df2a into python:3.12 Aug 11, 2026
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@bedevere-app bedevere-app Bot removed the awaiting core review label Aug 11, 2026
@StanFromIreland
StanFromIreland deleted the backport-fc9b11f-3.12 branch August 11, 2026 12:30
@StanFromIreland

StanFromIreland commented Aug 12, 2026

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Hmm, Bedevere didn't work...?
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@StanFromIreland StanFromIreland added needs backport to 3.10 needs backport to 3.11 only security fixes and removed needs backport to 3.10 needs backport to 3.11 only security fixes labels Aug 12, 2026
@miss-islington-app

miss-islington-app Bot commented Aug 12, 2026

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Thanks @StanFromIreland for the PR, and @Yhg1s for merging it 🌮🎉.. I'm working now to backport this PR to: 3.10.
🐍🍒⛏🤖
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@miss-islington-app

miss-islington-app Bot commented Aug 12, 2026

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Thanks @StanFromIreland for the PR, and @Yhg1s for merging it 🌮🎉.. I'm working now to backport this PR to: 3.11.
🐍🍒⛏🤖
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@miss-islington-app

miss-islington-app Bot commented Aug 12, 2026

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Sorry, @StanFromIreland and @Yhg1s, I could not cleanly backport this to 3.10 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker e37df2a6a71d6538698e2d3188a7c345b827640b 3.10
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@miss-islington-app

miss-islington-app Bot commented Aug 12, 2026

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Sorry, @StanFromIreland and @Yhg1s, I could not cleanly backport this to 3.11 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker e37df2a6a71d6538698e2d3188a7c345b827640b 3.11
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@bedevere-app

bedevere-app Bot commented Aug 12, 2026

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GH-155610 is a backport of this pull request to the 3.11 branch.
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@bedevere-app bedevere-app Bot removed the needs backport to 3.11 only security fixes label Aug 12, 2026
@StanFromIreland StanFromIreland removed the needs backport to 3.10 label Aug 12, 2026
pablogsal pushed a commit that referenced this pull request Aug 12, 2026
@StanFromIreland
[3.11] gh-149018: Use XML_SetHashSalt16Bytes in pyexpat/`_element…
cbaecf9 
…tree` when possible (GH-149023) (GH-155345) (#155610)

* [3.11] gh-149018: Use `XML_SetHashSalt16Bytes` in `pyexpat`/`_elementtree` when possible (GH-149023) (GH-155345)
(cherry picked from commit e37df2a)

Co-authored-by: Stan Ulbrych <[email protected]>
(cherry picked from commit fc9b11f)
(cherry picked from commit 24b8f12)

* Apply suggestions from code review

Co-authored-by: Stan Ulbrych <[email protected]>
pablogsal pushed a commit that referenced this pull request Aug 13, 2026
@StanFromIreland
[3.10] gh-149018: Use XML_SetHashSalt16Bytes in pyexpat/`_element…
ea70712 
…tree` when possible (GH-149023) (#155611)

* [3.10] gh-149018: Use `XML_SetHashSalt16Bytes` in `pyexpat`/`_elementtree` when possible (GH-149023) (GH-155345)
(cherry picked from commit e37df2a)
(cherry picked from commit 95cf26d)

Co-authored-by: Stan Ulbrych <[email protected]>
(cherry picked from commit fc9b11f)
(cherry picked from commit 24b8f12)

* Fix SetHashSalt16Bytes assignment in pyexpat.c
icanhasmath pushed a commit to ActiveState/cpython that referenced this pull request Oct 28, 2026
@StanFromIreland @icanhasmath
[3.10] pythongh-149018: Use XML_SetHashSalt16Bytes in pyexpat/`_e…
7eda8df 
…lementtree` when possible (pythonGH-149023) (python#155611)

* [3.10] pythongh-149018: Use `XML_SetHashSalt16Bytes` in `pyexpat`/`_elementtree` when possible (pythonGH-149023) (pythonGH-155345)
(cherry picked from commit e37df2a)
(cherry picked from commit 95cf26d)

Co-authored-by: Stan Ulbrych <[email protected]>
(cherry picked from commit fc9b11f)
(cherry picked from commit 24b8f12)

* Fix SetHashSalt16Bytes assignment in pyexpat.c

(cherry picked from commit ea70712)

3.9.25.x: 3.9 never received pythongh-90949 (the Expat allocation-tracker /
billion-laughs tuning API), so the PyExpat_CAPI capsule gains only the
SetHashSalt16Bytes slot, appended after SetReparseDeferralEnabled.
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@StanFromIreland @Yhg1s
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