In PHP before 5.6.31, 7.x before 7.0.21, and 7.1.x before 7.1.7, an error in the date extension's timelibmeridian parsing code could be used by attackers able to supply date strings to leak information from the interpreter, related to ext/date/lib/parsedate.c out-of-bounds reads affecting the phpparsedate function. NOTE: the correct fix is in the e8b7698f5ee757ce2c8bd10a192a491a498f891c commit, not the bd77ac90d3bdf31ce2a5251ad92e9e75 gist.