There is an updated pull request by dkwo against master on the void-packages repository

https://github.com/dkwo/void-packages zatmin
https://github.com/void-linux/void-packages/pull/31989

zathura: backport (improved) upstream patch for buffer overflow
Tested on x86_64-musl, fixes #31722 

A patch file from https://github.com/void-linux/void-packages/pull/31989.patch is attached