CVE-2026-54897

Oj (Optimized JSON) Ruby gem versions prior to 3.17.2 contain a heap use-after-free in Oj::Doc iterators (each_value, each_child, each_leaf). If a Ruby block yields during iteration and doc.close or d.close is called, the heap memory is freed while the C iterator is active, leading to a use-after...

CVE-2026-54897 Oj : Use-After-Free in Oj::Doc Iterators via Reentrant Close

Oj Optimized JSON is a JSON parser and Object marshaller packaged as a Ruby gem. Prior to 3.17.2, Oj::Doc iterators eachvalue, eachchild, eachleaf were vulnerable to a heap use-after-free. When a Ruby block yielded during iteration calls doc.close or d.close, the document's heap memory is freed...