CVE-2026-54897
Oj : Use-After-Free in Oj::Doc Iterators via Reentrant Close
- State
- Published
- Severity
- 2.1 Low
- Published
- Jun 30, 2026
- Updated
- Jul 1, 2026
- Reserved
- Jun 16, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 2.1 Low | CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | GitHub_M |
Weaknesses
- CWE-416 Use After Free
Affected Products
| Product | Versions |
|---|---|
ojohler55 |
|
References
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