[3.9] gh-80222: Fix email address header folding with long quoted-string (GH-122753) (GH-129111)#132371
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…ed-string (pythonGH-122753) (pythonGH-129111) Email generators using email.policy.default could incorrectly omit the quote ('"') characters from a quoted-string during header refolding, leading to invalid address headers and enabling header spoofing. This change restores the quote characters on a bare-quoted-string as the header is refolded, and escapes backslash and quote chars in the string. (cherry picked from commit 5aaf416) (cherry picked from commit a4ef689) Co-authored-by: R. David Murray <rdmurray@bitdance.com> Co-authored-by: Mike Edmunds <medmunds@gmail.com> Co-authored-by: Łukasz Langa <lukasz@langa.pl>
ambv merged commit d4df3c5 into python:3.9 14 checks passed
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Email generators using email.policy.default could incorrectly omit the quote ('"') characters from a quoted-string during header refolding, leading to invalid address headers and enabling header spoofing. This change restores the quote characters on a bare-quoted-string as the header is refolded, and escapes backslash and quote chars in the string.
(cherry picked from commit 5aaf416)
(cherry picked from commit a4ef689)