[New-bugs-announce] [issue31314] email throws exception with oversized header input

[Matthias Klose]

New submission from Matthias Klose:

[forwarded from https://bugs.debian.org/854001]

$ cat tst.py
#!/usr/bin/env python
import sys
import email

mail = email.message_from_string(
"""From: <postmaster at example.com>
To: <bounce at example.com>
Subject: demo
X-Overlong-Header-Name-causes-python-mail-to-crash-in-re-serialization-example:

Hello
""")
message = mail.as_string()
sys.stdout.write(message)

$ python tst.py 
Traceback (most recent call last):
  File "tst.py", line 13, in <module>
    message = mail.as_string()
  File "/usr/lib/python2.7/email/message.py", line 137, in as_string
    g.flatten(self, unixfrom=unixfrom)
  File "/usr/lib/python2.7/email/generator.py", line 83, in flatten
    self._write(msg)
  File "/usr/lib/python2.7/email/generator.py", line 115, in _write
    self._write_headers(msg)
  File "/usr/lib/python2.7/email/generator.py", line 164, in _write_headers
    v, maxlinelen=self._maxheaderlen, header_name=h).encode()
  File "/usr/lib/python2.7/email/header.py", line 408, in encode
    lastchunk, lastcharset = newchunks[-1]
IndexError: list index out of range

----------
components: email
messages: 301044
nosy: barry, doko, r.david.murray
priority: normal
severity: normal
status: open
title: email throws exception with oversized header input
versions: Python 2.7

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue31314>
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