The Pallets Project flask version Before 0.12.3 contains a CWE-20: Improper Input Validation vulnerability in flask that can result in 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. This vulnerability appears to have been fixed in 0.12.3.
github.com/advisories/GHSA-562c-5r94-xh97
github.com/pallets/flask
github.com/pallets/flask/commit/b178e89e4456e777b1a7ac6d7199052d0dfdbbbe
github.com/pallets/flask/pull/2691
github.com/pallets/flask/releases/tag/0.12.3
lists.debian.org/debian-lts-announce/2019/08/msg00025.html
nvd.nist.gov/vuln/detail/CVE-2018-1000656
security.netapp.com/advisory/ntap-20190221-0001
usn.ubuntu.com/4378-1