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In PHP versions 4.0.0 through 4.4.6 and 5.0.0 through 5.2.1, the mail() function improperly handles email message bodies containing a null byte ('\0'). When a null byte is present, the function truncates the message at the first occurrence of this byte, discarding any subsequent content. This can be exploited by attackers to manipulate the content of emails sent by PHP applications, especially in scenarios where the integrity or completeness of the message is critical.
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