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The memory leak backport patch that was added to RHEL 7 was missed for RHEL 8, likely due to timing of the RHEL 8 Beta which came out at roughly the same time.

Based on looking at the github repo information for the patches this issue appears to have been fixed in 5.8.1pre1 which is after the version in RHEL 8.

   https://github.com/net-snmp/net-snmp/commit/c6facf2f080c9e1ea803e4884dc92889ec83d990

   https://github.com/net-snmp/net-snmp/commit/67726f2a74007b5b4117fe49ca1e02c86110b624

See the following for further details of the bug.

   Bug 1650393 - backport two memory leak fixes in snmplib
   https://bugzilla.redhat.com/show_bug.cgi?id=1650393

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: net-snmp security and bug fix update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2023:2969