PuTTY security vunerability in <0.63 versions

Is WinSCP vunreable to the same vunerabilities as PuTTY 0.62 and earlier?

https://www.chiark.greenend.org.uk/~sgtatham/putty/

PuTTY 0.63, released today, fixes four security holes in 0.62 and before: vuln-modmul, vuln-signature-stringlen, vuln-bignum-division-by-zero, private-key-not-wiped.

This is fixed in 5.2.4beta and 5.1.7:

https://winscp.net/tracker/1039