A vulnerability was found in PHP versions 7.2.x below 7.2.26, 7.3.x below 7.3.13 and 7.4.0, PHP bcmath extension functions on some systems, can be tricked into reading beyond the allocated space by supplying it with string containing characters that are identified as numeric by the OS but aren't ASCII numbers. This can read to disclosure of the content of some memory locations.
Created php tracking bugs for this issue:
Affects: fedora-all [bug 1786568]
Any version of PHP as shipped with Red Hat Enterprise Linux are not affected. This flaw affected php running only on top of Windows Operating System, the bug itself is related to OS specific isdigit() function implementation.