Oj: Use-After-Free in Oj::Parser array_class/hash_class GC Marking_CVE-2026-54901
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, Oj::Parser in usual mode does not mark array_class and hash_class references during garbage collection, leading to Use-After-Free. If GC runs after the class is assi...