When I am trying to push my WordPress project to GitHub I got this error
error: RPC failed; curl 56 OpenSSL SSL_read: error:140943FC:SSL
routines:ssl3_read_bytes:sslv3 alert bad record mac, errno 0
send-pack: unexpected disconnect while reading sideband packet
fatal: the remote end hung up unexpectedly
Everything up-to-date
The message "bad record mac" means that the MAC, or message authentication code, protecting your connection from tampering failed. In other words, your connection has been corrupted or tampered with, either intentionally or unintentionally. When this happens, the only thing to do is drop the connection.
It's likely that you have some sort of network problem. That could be a flaky connection (maybe your ISP is having problems), a proxy, an antivirus software, or a third-party firewall. It is possible but extremely unlikely that GitHub is having an issue.
If you are using a proxy, try moving to another network. If you're using a third-party antivirus or firewall, try completely uninstalling it and restarting. You could also check various websites to see if your ISP is having problems.