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Description of problem:
When unbound is configured with DNS over TLS for forwarding, unbound will continue to consume memory until all system memory is exhausted.

Version-Release number of selected component (if applicable):
unbound-1.7.3-8.el8.x86_64


How reproducible:
Always

Steps to Reproduce:
1. Configure unbound to use DNS over TLS for forward lookups
    server:
    forward-zone:
    name: "."
    forward-ssl-upstream: yes
    forward-addr: 9.9.9.9@853   

2. Monitor unbound process with top or ps

3. Perform DNS queries on unbound so that unbound queries the forwarder

4. Observe memory consumption continue to grow

Actual results:
Unbound will continue to consume memory until eventually all system memory and swap space is exhausted.

Expected results:
Unbound should not continue to consume memory

Additional info:
This issue was reported to unbound, and appears to have been fixed with a patch upstream.
https://www.nlnetlabs.nl/bugs-script/show_bug.cgi?id=4149
https://github.com/NLnetLabs/unbound/commit/377d5b426a30fc915cf7905786f93c0ec89845b7

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 (unbound bug fix and enhancement 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/RHBA-2020:4645