CVE-2026-54897
Severity CVSS v4.0:
LOW
Type:
CWE-416
Use After Free
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. Prior to 3.17.2, Oj::Doc iterators (each_value, each_child, each_leaf) 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 while the C iterator is still running. When control returns from the block, the iterator reads from the freed region, producing a use-after-free accessible from pure Ruby. This issue has been fixed in version 3.17.2.
Impact
Base Score 4.0
2.10
Severity 4.0
LOW