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Test your applicationsUpgrade RHEL:7 tkinter to version 0:2.7.5-83.el7_6 or higher.
This issue was patched in RHSA-2020:1462.
Note: Versions mentioned in the description apply only to the upstream tkinter package and not the tkinter package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
Python's elementtree C accelerator failed to initialise Expat's hash salt during initialization. This could make it easy to conduct denial of service attacks against Expat by constructing an XML document that would cause pathological hash collisions in Expat's internal data structures, consuming large amounts CPU and RAM. The vulnerability exists in Python versions 3.7.0, 3.6.0 through 3.6.6, 3.5.0 through 3.5.6, 3.4.0 through 3.4.9, 2.7.0 through 2.7.15.