[3.13] gh-143935: Email preserve parens when folding comments (GH-143936) #144035
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…H-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>
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pablogsal
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Jan 25, 2026
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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