A flaw was found in The Pallets Project flask version Before 0.12.3. An Improper Input Validation vulnerability in flask that can result in a large amount of memory usage possibly leading to denial of service. This attack appear to be exploitable via Attacker provides JSON data in incorrect encoding.
Created python-flask tracking bugs for this issue:
Affects: fedora-all [bug 1623179]
This issue affects the versions of python-flask as shipped with Red Hat Enterprise Linux 7.
Although Red Hat Satellite 6 contains the vulnerable component, the former is not affected due to python-flask only receiving JSON data created by other Red Hat Satellite 6 components, not user-controlled JSON data, which makes the attack unfeasible.
This issue has been addressed in the following products:
Red Hat Enterprise Linux 7 Extras
Via RHSA-2020:0870 https://access.redhat.com/errata/RHSA-2020:0870
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):