[3.10] gh-143935: Email preserve parens when folding comments (GH-143936) - #144350
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February 3, 2026 16:33
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…ythonGH-143936) Fix a bug in the folding of comments when flattening an email message using a modern email policy. Comments consisting of a very long sequence of non-foldable characters could trigger a forced line wrap that omitted the required leading space on the continuation line, causing the remainder of the comment to be interpreted as a new header field. This enabled header injection with carefully crafted inputs. (cherry picked from commit 17d1490) Co-authored-by: Seth Michael Larson seth@python.org Co-authored-by: Denis Ledoux dle@odoo.com - Issue: Fix folding of long comments of unfoldable characters in email headers python#143935 Signed-off-by: Edgar Ramírez Mondragón <edgarrm358@gmail.com>
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Fix a bug in the folding of comments when flattening an email message using a modern email policy. Comments consisting of a very long sequence of non-foldable characters could trigger a forced line wrap that omitted the required leading space on the continuation line, causing the remainder of the comment to be interpreted as a new header field. This enabled header injection with carefully crafted inputs.
(cherry picked from commit 17d1490)
Co-authored-by: Seth Michael Larson seth@python.org
Co-authored-by: Denis Ledoux dle@odoo.com