[3.11] gh-121284: Fix email address header folding with parsed encoded-word (GH-122754)#131405
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…-word (pythonGH-122754) Email generators using email.policy.default may convert an RFC 2047 encoded-word to unencoded form during header refolding. In a structured header, this could allow 'specials' chars outside a quoted-string, leading to invalid address headers and enabling spoofing. This change ensures a parsed encoded-word that contains specials is kept as an encoded-word while the header is refolded. [Better fix from @bitdancer.] --------- (cherry picked from commit 295b53d) Co-authored-by: Mike Edmunds <medmunds@gmail.com> Co-authored-by: R David Murray <rdmurray@bitdance.com> Co-authored-by: Petr Viktorin <encukou@gmail.com>
bitdancer approved these changes Mar 18, 2025
ambv merged commit 0a66052 into python:3.11 27 checks passed
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Email generators using email.policy.default may convert an RFC 2047
encoded-word to unencoded form during header refolding. In a structured
header, this could allow 'specials' chars outside a quoted-string,
leading to invalid address headers and enabling spoofing. This change
ensures a parsed encoded-word that contains specials is kept as an
encoded-word while the header is refolded.
[Better fix from @bitdancer.]
(cherry picked from commit 295b53d)
Co-authored-by: Mike Edmunds medmunds@gmail.com
Co-authored-by: R David Murray rdmurray@bitdance.com
Co-authored-by: Petr Viktorin encukou@gmail.com