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email: address list folding encodes list-separator comma #100884

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#100885
Closed
email: address list folding encodes list-separator comma#100884
#100885
Labels
topic-emailtype-bugAn unexpected behavior, bug, or error

Description

@t-8ch
t-8ch
opened on Jan 9, 2023

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

Linked PRs

Activity

  1. t-8ch
    added
    type-bugAn unexpected behavior, bug, or error
    on Jan 9, 2023
  2. t-8ch
    added 3 commits that reference this issue on Jan 9, 2023

    pythonGH-100884: email/_header_value_parser: use existing ListSeparator

    b1f41b8

    pythonGH-100884: email/_header_value_parser: don't encode list separa…

    98ab61d

    pythonGH-100884: email/_header_value_parser: don't encode list separa…

    75a89ca
  3. mdboom
    added
    topic-email
    on Jan 9, 2023
  4. mricon
    added a commit that references this issue on Jan 9, 2023

    tests: add another test for very long email address

    26e7d3c
  5. serhiy-storchaka
    closed this as completedin #100885on Feb 17, 2024
  6. serhiy-storchaka
    added a commit that references this issue on Feb 17, 2024

    gh-100884: email/_header_value_parser: don't encode list separators (G…

    09fab93
  7. miss-islington
    added 2 commits that reference this issue on Feb 17, 2024

    pythongh-100884: email/_header_value_parser: don't encode list separa…

    5f617f2

    pythongh-100884: email/_header_value_parser: don't encode list separa…

    a2640a5
  8. serhiy-storchaka
    added 2 commits that reference this issue on Feb 17, 2024

    [3.12] gh-100884: email/_header_value_parser: don't encode list separ…

    9148b77

    [3.11] gh-100884: email/_header_value_parser: don't encode list separ…

    70754d2
  9. woodruffw
    added a commit that references this issue on Mar 4, 2024

    pythongh-100884: email/_header_value_parser: don't encode list separa…

    90daba0
  10. diegorusso
    added a commit that references this issue on Apr 17, 2024

    pythongh-100884: email/_header_value_parser: don't encode list separa…

    8b88128
  11. serhiy-storchaka
    added 3 commits that reference this issue on May 16, 2024

    pythongh-118643: Fix AttributeError in the email module

    af3ced0

    pythongh-118643: Fix AttributeError in the email module

    ad85b83

    gh-118643: Fix AttributeError in the email module (GH-119099)

    858b9e8
  12. miss-islington
    added 2 commits that reference this issue on May 22, 2024

    pythongh-118643: Fix AttributeError in the email module (pythonGH-119099

    6d4b54f

    pythongh-118643: Fix AttributeError in the email module (pythonGH-119099

    d111cba
  13. serhiy-storchaka
    added 3 commits that reference this issue on May 22, 2024

    [3.11] pythongh-118643: Fix AttributeError in the email module (pytho…

    9bfb6ae

    [3.13] gh-118643: Fix AttributeError in the email module (GH-119099) (G…

    6892b40

    [3.12] gh-118643: Fix AttributeError in the email module (GH-119099) (G…

    8c96850
  14. pablogsal
    added a commit that references this issue on May 23, 2024

    [3.11] gh-118643: Fix AttributeError in the email module (GH-119099) (#…

    4762b36
  15. estyxx
    added a commit that references this issue on Jul 17, 2024

    pythongh-118643: Fix AttributeError in the email module (pythonGH-119099

    c068bee
  16. LukasWoodtli
    added a commit that references this issue on Jan 22, 2025

    pythongh-100884: email/_header_value_parser: don't encode list separa…

    f306be6

  17. mcepl commented on Mar 11, 2025

    @mcepl
    mcepl
    on Mar 11, 2025
    Contributor

    Shouldn’t CVE-2025-1795 be mentioned here?

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