ohler55

### Summary `Oj::Parser` in SAJ mode does not protect cached object keys (≥ 35 bytes) from garbage collection. A Ruby callback that triggers GC inside `hash_end` can cause the key string to be reclaimed while the C parser still holds a pointer to it. The subsequent access to…

### Summary `Oj::Parser` in usual mode does not mark `array_class` and `hash_class` references during garbage collection. If GC runs after the class is assigned but before a parse, the class object is reclaimed, leaving the parser holding a dangling VALUE. The subsequent…

### Summary `Oj::Parser#parse` in usual mode with `create_id` enabled is vulnerable to heap corruption via a negative-size `memcpy`. When a JSON object key is exactly 65,535 bytes long, an integer truncation in `form_attr` (`usual.c:63`) converts the length to `-1` before…

### Summary `Oj::Doc` iterators (`each_value`, `each_child`, `each_leaf`) are 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 while the C iterator is still running. When control…

### Summary `Oj::Doc#each_child`, when invoked recursively over a deeply nested JSON document, overflows a fixed-size stack buffer and aborts the process. This is a denial of service reachable from untrusted JSON. ### Details Two-step chain in `ext/oj/fast.c`: 1.…

### Summary `Oj.dump` is vulnerable to a stack-based buffer overflow when a large `:indent` value is provided by the developer. `fill_indent` in `dump.h` calls `memset(indent_str, ' ', (size_t)opts->indent)` without validating the size. When `opts->indent` is set to `INT_MAX`…

### Summary Disabling `symbol_keys` on a reused `Oj::Parser` instance triggers a heap use-after-free. When `symbol_keys` is toggled from `true` to `false`, `opt_symbol_keys_set` frees the internal key cache (`cache_free`) but does not clear the pointer. The next `parse` call…

### Summary `Oj.load` in `:object` mode reads uninitialized stack memory (and, for long keys, reads out of bounds) when parsing a JSON object whose key is 254 bytes or longer. The interned bytes can surface to the caller, disclosing process stack memory. ### Details In…

Agoo before 2.14.3 does not reject GraphQL fragment spreads that form cycles, leading to an application crash. NOTE: the vendor has disputed this on the grounds that it is not the server's responsibility to "enforce all the various ways a developer could write code with logic…