gitconnectgit in connect.c in Git before 2.30.1 allows a repository path to contain a newline character, which may result in unexpected cross-protocol requests, as demonstrated by the git://localhost:1234/%0d%0a%0d%0aGET%20/%20HTTP/1.1 substring.
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-40330.json"