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Test your applicationsUpgrade RHEL:7 tfm-rubygem-os to version 0:1.0.0-1.el7sat or higher.
This issue was patched in RHSA-2021:1313.
Note: Versions mentioned in the description apply only to the upstream tfm-rubygem-os package and not the tfm-rubygem-os package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
The ZlibDecoders in Netty 4.1.x before 4.1.46 allow for unbounded memory allocation while decoding a ZlibEncoded byte stream. An attacker could send a large ZlibEncoded byte stream to the Netty server, forcing the server to allocate all of its free memory to a single decoder.