GeezerVison is showing github.com — [3.11] gh-121650: Encode newlines in headers, and verify headers are sound (GH-122233) by ambv · Pull Request #122608 · python/cpython
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ambv
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Aug 2, 2024
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Per RFC 2047:
[...] these encoding schemes allow the
encoding of arbitrary octet values, mail readers that implement this
decoding should also ensure that display of the decoded data on the
recipient's terminal will not cause unwanted side-effects
It seems that the "quoted-word" scheme is a valid way to include a newline character in a header value, just like we already allow undecodable bytes or control characters.
They do need to be properly quoted when serialized to text, though.
GH-GH- Verify that email headers are well-formed
This should fail for custom fold() implementations that aren't careful about newlines.
(cherry picked from commit 0976339)
📚 Documentation preview 📚: https://cpython-previews--122608.org.readthedocs.build/
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…s are sound (pythonGH-122233)
GH-GH- Encode header parts that contain newlines
Per RFC 2047:
> [...] these encoding schemes allow the
> encoding of arbitrary octet values, mail readers that implement this
> decoding should also ensure that display of the decoded data on the
> recipient's terminal will not cause unwanted side-effects
It seems that the "quoted-word" scheme is a valid way to include
a newline character in a header value, just like we already allow
undecodable bytes or control characters.
They do need to be properly quoted when serialized to text, though.
GH-GH- Verify that email headers are well-formed
This should fail for custom fold() implementations that aren't careful
about newlines.
(cherry picked from commit 0976339)
Co-authored-by: Petr Viktorin <[email protected]>
Co-authored-by: Bas Bloemsaat <[email protected]>
Co-authored-by: Serhiy Storchaka <[email protected]>
This was referenced Aug 2, 2024
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LGTM: straightforward backport and the change is properly documented as .. versionadded:: 3.11.10 with "Notable changes in 3.11.10" in What's New in Python 3.11. I compared this 3.11 change to the change in the main branch.
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