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email: address list folding encodes list-separator comma #100884
Description
Bug report
When during address list folding a separating comma ends up on a folded line containing that is to be unicode-encoded than the separator itself is also unicode encoded. Instead the comma should still a plain comma.
This is rejected by some mail servers:
ZZZ: host YYY said:
550 Invalid address in message header. Consult RFC2822. (in reply to end of
DATA command)
Minimal example:
>>> import email
>>> m = email.message.EmailMessage()
>>> t = '01234567890123456789012345678901234567890123456789012345678901@example.org, ä <foo@example.org>'
>>> m['to'] = t
>>> m.as_string()
'to: 01234567890123456789012345678901234567890123456789012345678901@example.org\n =?utf-8?q?=2C?= =?utf-8?q?=C3=A4?= <foo@example.org>\n\n'Your environment
- CPython versions tested on: 3.10.9, latest main (e47b139)
- Operating system and architecture: ArchLinux x86_64
Activity
pythonGH-100884: email/_header_value_parser: use existing ListSeparator
pythonGH-100884: email/_header_value_parser: don't encode list separa…
pythonGH-100884: email/_header_value_parser: don't encode list separa…
tests: add another test for very long email address
gh-100884: email/_header_value_parser: don't encode list separators (G…
pythongh-100884: email/_header_value_parser: don't encode list separa…
pythongh-100884: email/_header_value_parser: don't encode list separa…
[3.12] gh-100884: email/_header_value_parser: don't encode list separ…
[3.11] gh-100884: email/_header_value_parser: don't encode list separ…
pythongh-100884: email/_header_value_parser: don't encode list separa…
pythongh-100884: email/_header_value_parser: don't encode list separa…
pythongh-118643: Fix AttributeError in the email module
pythongh-118643: Fix AttributeError in the email module
gh-118643: Fix AttributeError in the email module (GH-119099)
pythongh-118643: Fix AttributeError in the email module (pythonGH-119099
pythongh-118643: Fix AttributeError in the email module (pythonGH-119099
[3.11] pythongh-118643: Fix AttributeError in the email module (pytho…
[3.13] gh-118643: Fix AttributeError in the email module (GH-119099) (G…
[3.12] gh-118643: Fix AttributeError in the email module (GH-119099) (G…
[3.11] gh-118643: Fix AttributeError in the email module (GH-119099) (#…
pythongh-118643: Fix AttributeError in the email module (pythonGH-119099
pythongh-100884: email/_header_value_parser: don't encode list separa…
mcepl commentedon Mar 11, 2025
Shouldn’t CVE-2025-1795 be mentioned here?