PSA: update your DNS resolvers (PiHole, unbound, Bind9, dsnmasq) to patch DNSSEC vulnerability
Researchers recently found a vulnerability in the way DNS resolvers handle DNSSEC validation that allow attackers to DoS resolvers with a single DNS request
I'm not familiar with off-the-shelf DNS filtering on mobile, but since running a DNS resolver on-device would be impractical, I think they must be using a DNS server that they maintain. Which means that unless I'm wrong, the vulnerability lies on their end, you should be fine.