From release notes of 12.22.7, 14.18.1:
CVE-2021-22959: HTTP Request Smuggling due to spaced in headers (Medium)
The http parser accepts requests with a space (SP) right after the header name before the colon. This can lead to HTTP Request Smuggling (HRS). More details will be available at CVE-2021-22959 after publication.
CVE-2021-22960: HTTP Request Smuggling when parsing the body (Medium)
The parse ignores chunk extensions when parsing the body of chunked requests. This leads to HTTP Request Smuggling (HRS) under certain conditions. More details will be available at CVE-2021-22960 after publication.
And 16.11.1, which we seem to have never had.