R. David Murray <rdmur...@bitdance.com> added the comment:
Not a security issue, no. This isn't C where a stack overflow can give an
attacker a vector for injecting arbitrary code.
Per the Parser contract ("raise no exceptions, only register defects"), this
should, as you say, register a defect
(email.errors.InvalidMultipartContentTransferEncodingDefect) and assume a CTE
of 7bit for the rest of the parsing. The problem here is that the feedparser
is running into the "hack" I put in place in python3.2 for dealing with invalid
binary data in headers (which is to turn it into a Header with charset
unknown-8bit). That works most of the time, but in cases like this it breaks
down :(
Note that the new API (policy=default and friends) handles this without error.
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<https://bugs.python.org/issue36910>
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