Tested putty-nd7.21p2.exe.bak It is not working as expected. I agree with you, it is better to get ProxyCommand or ProxyJump with -W and -J options implemented in PuTTY up stream.
Terrapin vulnerability in some SSH protocol extensions (aka CVE-2023-48795) has been addressed in version 0.80 https://terrapin-attack.com/
https://github.com/NoMoreFood/putty-cac/tree/master/packager/winget
Enable winget install for PuTTY-nd
I had the same issue. The fix addresssed the bug. Thanks.
Please add support for ProxyJump enable jumping across multiple hosts
Thanks Dong Lu, I have tested the version 7.20 patch 1. It is working as expected for this specific feature.
Reference: Support OpenSSH ssh-agent in WinSCP https://winscp.net/forum/viewtopic.php?t=26033