CVE-2026-54903 Oj: Integer Overflow in Oj.load 2GB String Handling

Oj Optimized JSON is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, Oj.load is vulnerable to heap corruption when parsing a JSON string longer than 2 GB. An integer overflow in bufappendstring buf.h:61 converts the string length to a large negative sizet,...

CVE-2026-54903

Oj is a Ruby gem that contains a heap corruption vulnerability in Oj.load for JSON strings larger than 2 GB, caused by an integer overflow in buf_append_string (buf.h:61) that turns the length into a negative size_t, leading memcpy to copy out-of-bounds data and crash. Affected versions are those...

GHSA-FM7P-MPRW-WJM9 Oj: intern.c form_attr (uninitialized stack read)

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 ext/oj/intern.c, formattr handles the...

Oj: intern.c form_attr (uninitialized stack read)

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 ext/oj/intern.c, formattr handles the...

PT-2026-51089

Name of the Vulnerable Software and Affected Versions Oj versions prior to 3.17.2 Description Oj is a JSON parser and Object marshaller for Ruby. The Oj.load function is susceptible to heap corruption when processing a JSON string exceeding 2 GB. An integer overflow occurs within the buf append...

Oj - Integer Overflow in Oj.load 2GB String Handling

Summary Oj.load is vulnerable to heap corruption when parsing a JSON string longer than 2 GB. An integer overflow in bufappendstring buf.h:61 converts the string length to a large negative sizet, causing memcpy to copy an astronomically large amount of data out of bounds. This crashes the process...