CVE-2026-47235

SimulationCraft is a tool to explore combat mechanics in World of Warcraft. In builds after release-820-01 and before the identified May 7, 2026 nightly, the bcp api.cpp loop over the JSON sockets array uses slot data["sockets"].Size() without bounding gem idx by MAX GEM SLOTS, which is four in engine/sc enums.hpp. The destination gem id and gem bonus id arrays in engine/item/item.hpp have only four elements. More than four socket entries therefore write beyond gem id into the adjacent gem bonus id vector storage; bonus list entries can also access gem bonus id out of bounds. Corrupting a vector's M start pointer causes the item t destructor to free an attacker-influenced pointer during normal cleanup. The advisory reports crashes and code execution demonstrated in a testing environment. Attack inputs can arrive through a malicious .simc profile with a [[equipment]] section, a compromised addon export, or Battle.net API responses modified by an attacker with a privileged network position. The fix is contained in the nightly build identified as simc-1205-01-516b5d7; no containing release tag is available.