Matrix Synapse before 0.28.1 is prone to a denial of service flaw where malicious events injected with depth = 2^63 - 1 render rooms unusable, related to federation/federation_base.py and handlers/message.py, as exploited in the wild in April 2018.
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-10657.json"