gh-153406: Raise ValueError, not OverflowError, for out-of-range dates in email.utils.parsedate_to_datetime#153407
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…e dates in email.utils.parsedate_to_datetime email.utils.parsedate_to_datetime documented that it raises ValueError for an invalid date, but it leaked OverflowError when the parsed year or timezone offset was too large for the datetime and timedelta constructors, and that OverflowError also escaped the modern header parsing path since DateHeader.parse only caught ValueError. Wrap the datetime and timezone construction so an OverflowError is re-raised as a ValueError with the original chained as the cause, which restores the documented contract and lets the existing header handler record an InvalidDateDefect instead of raising.
bitdancer
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Jul 9, 2026
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Good catch. Thanks for the patch.
bitdancer
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needs backport to 3.13
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Thanks @tonghuaroot for the PR, and @bitdancer for merging it 🌮🎉.. I'm working now to backport this PR to: 3.13. |
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Thanks @tonghuaroot for the PR, and @bitdancer for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14. |
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Thanks @tonghuaroot for the PR, and @bitdancer for merging it 🌮🎉.. I'm working now to backport this PR to: 3.15. |
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GH-153433 is a backport of this pull request to the 3.13 branch. |
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GH-153434 is a backport of this pull request to the 3.14 branch. |
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GH-153435 is a backport of this pull request to the 3.15 branch. |
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needs backport to 3.15
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email.utils.parsedate_to_datetimebuilds adatetime(and atimezoneoffset) from the parsed date tuple without catchingOverflowError, so an out-of-range year or timezone offset escapes asOverflowErrorinstead of the documentedValueError.email.headerregistry.DateHeader.parseonly catchesValueErrorto record anInvalidDateDefect, so the same input mademessage['Date'].datetimeraise instead of recording a defect. Normalizing the exception at the source inparsedate_to_datetimefixes both: the direct call now raisesValueError, and the header path recordsInvalidDateDefect. Valid dates are unchanged.