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.
Metrics
Affected Vendors & Products
| Vendors | Products |
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| Ohler |
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| Ohler55 |
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References
History
Wed, 01 Jul 2026 10:30:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Ohler
Ohler oj Ohler55 Ohler55 oj |
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| Vendors & Products |
Ohler
Ohler oj Ohler55 Ohler55 oj |
Tue, 30 Jun 2026 23:45:00 +0000
| Type | Values Removed | Values Added |
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| 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. | |
| Title | Oj : Use-After-Free in Oj::Doc Iterators via Reentrant Close | |
| Weaknesses | CWE-416 | |
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cvssV4_0
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-06-30T23:22:43.648Z
Updated: 2026-06-30T23:22:43.648Z
Reserved: 2026-06-16T13:49:33.555Z
Link: CVE-2026-54897
Vulnrichment
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NVD
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Redhat
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