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Saint NatJack, Hijacker of NAT Tables
Patron of home routers, shared cloud networks, and everyone who thought NAT was a firewall.
Life
On 6 August 2026 Malcolm Stagg presented at Black Hat a family of attacks on address translation tables, the ones routers, hotspots, virtual machines and cloud gateways use to share a single IP. Anyone behind the same NAT could hijack other users' TCP connections, spoof their DNS replies or fill the table until nobody could connect. Every implementation tested turned out to be vulnerable to at least one of the techniques.
Prayer
O Saint NatJack, who swims among the neighbour's ephemeral ports, keep our traffic encrypted even when the router claims to protect us. Amen.
How to celebrate
Celebrated by updating Windows, Hyper-V and the Linux kernel, using TLS and encrypted DNS everywhere, and giving guests a subnet of their own.
Same NAT, same fate.