Folding email comments of unfoldable characters doesn't preserve parenthesis

When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not sanitized.

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CPython 安全漏洞

CPython是Python基金会的一个用C语言实现的Python解释器。 CPython存在安全漏洞，该漏洞源于折叠仅包含不可折叠字符的电子邮件标头中的长注释时未保留括号，可能导致在用户控制且未清理的地址中注入标头。

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