There is a new pull request by sgn against master on the void-packages repository

https://github.com/sgn/void-packages wireshark-CVE-2020-26422
https://github.com/void-linux/void-packages/pull/27413

wireshark: update to 3.4.2.
CVE-2020-26422

A patch file from https://github.com/void-linux/void-packages/pull/27413.patch is attached