CVE-2026-54897
Oj : Use-After-Free in Oj::Doc Iterators via Reentrant Close
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-416 |
| Vendor | ohler55 |
| Product | oj |
| Published | Jun 30, 2026 |
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Affected Versions
ohler55 / oj
< 3.17.2