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Null-byte
From PerlNet
The null byte, often represented as \0 in programs, or %00 in URLs, plays a special part in Perl security. Perl strings can be of any length, and can contain any characters, whereas C-strings are usually terminated by the null-byte.
A number of interesting security exploits exist by inserting null-bytes into Perl strings, resulting in Perl having a different view of the string to underlying C system calls.
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