Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
From VID-6FAA7FEB-D3FA-11EA-9ABA-0C9D925BBBC0:
The X.org project reports:
The X Input Method (XIM) client implementation in libX11 has some
integer overflows and signed/unsigned comparison issues that can
lead to heap corruption when handling malformed messages from an
input method.
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