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<?php $regex = '/(.*(?=ab\K))/'; $subject = "aaaaxyzaabaa"; // Comment/uncomment below as wanted. // All 3 functions are vulnerable (note, other functions are affected as well) preg_match($regex,$subject,$x); var_dump($x);
Output for 5.4.45, 5.5.29 - 5.5.35, 5.6.13 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: preg_match(): Get subpatterns list failed in /in/gfKHm on line 8 array(0) { }
Output for 5.4.2 - 5.4.44, 5.5.24 - 5.5.28, 5.6.8 - 5.6.12

Process exited with code 139.
preferences:
185.24 ms | 402 KiB | 240 Q