If I read it properly that security vulnerability was patched back to August 2018 and I just wanted the confirmation OPNsense had also that patch.
Many thanks.
OPNsense is based on HardenedBSD and yes HardenedBSD has patched this.
ref: https://hardenedbsd.org/article/op/2018-08-15/stable-release-hardenedbsd-stable-11-stable-v11000563