Endless Loop DoS Vulnerability in mb_encode_mimeheader() Function in PHP 8.3.* before 8.3.5

CVE-2024-2757

In PHP 8.3.* before 8.3.5, function mb_encode_mimeheader() runs endlessly for some inputs that contain long strings of non-space characters followed by a space. This could lead to a potential DoS attack if a hostile user sends data to an application that uses this function.

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