PHP3 with safemode enabled does not properly filter shell metacharacters from commands that are executed by popen, which could allow remote attackers to execute commands.

The deserialization code in PHP before 4.3.10 and PHP 5.x up to 5.0.2 allows remote attackers to cause a denial of service and execute arbitrary code via untrusted data to the unserialize function that may trigger "information disclosure, double-free and negative reference index array underflow" results.

Buffer overflow in the exifreaddata function in PHP before 4.3.10 and PHP 5.x up to 5.0.2 allows remote attackers to execute arbitrary code via a long section name in an image file.

Unspecified vulnerability in the phpstreamscandir function in the stream implementation in PHP before 5.3.15 and 5.4.x before 5.4.5 has unknown impact and remote attack vectors, related to an "overflow."

Unspecified vulnerability in PHP before 5.2.1 allows attackers to "clobber" certain super-global variables via unspecified vectors.

zendhashdelkeyorindex in zendhash.c in PHP before 4.4.3 and 5.x before 5.1.3 can cause zendhashdel to delete the wrong element, which prevents a variable from being unset even when the PHP unset function is called, which might cause the variable's value to be used in security-relevant operations.

The c-client library 2000, 2001, or 2004 for PHP before 4.4.4 and 5.x before 5.1.5 do not check the (1) safemode or (2) openbasedir functions, and when used in applications that accept user-controlled input for the mailbox argument to the imapopen function, allow remote attackers to obtain access to an IMAP stream data structure and conduct unauthorized IMAP actions.