[3.9] gh-121284: Fix email address header folding with parsed encoded-word (GH-122754) by encukou · Pull Request #131412 · python/cpython (original) (raw)

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encukou

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@encukou encukou commented

Mar 18, 2025

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edited by bedevere-appbot

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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)

…ncoded-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

gentoo-bot pushed a commit to gentoo/cpython that referenced this pull request

Apr 9, 2025

…ncoded-word (pythonGH-122754) (pythonGH-131412)

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