How to fix BouncyCastle Vulnerability? [closed]

I am using iTextSharp 5.5.13.3 which has dependency on BouncyCastle. BouncyCastle has Vulnerability which I want to remediate.

I tried updating BouncyCastle to latest version but it also has Vulnerability.

Any suggestion?

Below are the links:

1. https://github.com/advisories/GHSA-8xfc-gm6g-vgpv
2. https://github.com/advisories/GHSA-v435-xc8x-wvr9
3. https://github.com/advisories/GHSA-m44j-cfrm-g8qc

Vulnerabilities in BouncyCastle