jq is a command-line JSON processor. In 1.8.1 and earlier, unbounded recursion in jv_object_merge_recursive() allows a crafted jq program to crash the process with a segfault. The function is reachable through the * operator when both operands are objects.
https://github.com/jqlang/jq/security/advisories/GHSA-mg96-6h3q-g846