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GeezerVison is showing github.com — gh-155322: Validate mutable structseq layout attributes by BHUVANSH855 · Pull Request #155361 · python/cpython

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@BHUVANSH855

@BHUVANSH855 BHUVANSH855 commented Aug 7, 2026

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Summary

Fix a crash in heap-allocated PyStructSequence types when the writable n_fields attribute is modified from Python before constructing a new instance.

The constructor now validates member access using the actual tp_members array instead of relying on the mutable n_fields attribute, preventing out-of-bounds access that could lead to a segmentation fault.

Adds a regression test covering the reported crash.

Closes issue gh-155322.

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@BHUVANSH855
pythongh-155322: Validate mutable structseq layout attributes
984d378
@bedevere-app bedevere-app Bot mentioned this pull request Aug 7, 2026
Mutable heap PyStructSequence types can segfault after modifying n_fields #155322
Open
@bedevere-app bedevere-app Bot added the awaiting review label Aug 7, 2026
@BHUVANSH855
pythongh-155322: Add NEWS entry for PyStructSequence crash fix
77fde83
@github-actions

github-actions Bot commented Nov 6, 2026

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This PR is stale because it has been open for 90 days with no activity.
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@github-actions github-actions Bot added the stale Stale PR or inactive for long period of time. label Nov 6, 2026
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@BHUVANSH855
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