GHSA-X2F5-4PRF-W687 Ruby json: JSON generator heap buffer overflow when streaming to an IO

Summary JSON.dumpobj, io and JSON::Stategenerateobj, io can write past the internal JSON generator buffer when a streamed object contains an attacker-controlled string near 16 KB. The issue is a heap out-of-bounds write in the IO-streaming path and is demonstrated as a reliable process crash /...