CVE-2026-54896
Severity CVSS v4.0:
LOW
Type:
CWE-122
Heap-based Buffer Overflow
Publication date:
01/07/2026
Last modified:
01/07/2026
Description
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, when in object mode, Oj.dump is vulnerable to a heap buffer overflow when serializing Exception objects with a large :indent value. The serializer allocates a buffer sized for the object's attributes but does not account for the indent bytes added on each write. With indent: 5000, the accumulation of 5,000-byte indent strings overflows the 13,150-byte heap allocation, corrupting adjacent heap memory. This issue has been fixed in version 3.17.2.
Impact
Base Score 4.0
2.10
Severity 4.0
LOW