Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, Oj::Parser in usual mode does not mark array_class and hash_class references during garbage collection, leading to Use-After-Free. If GC runs after the class is assigned but before a parse, the class object is reclaimed, leaving the parser holding a dangling VALUE. The subsequent parse call dereferences the freed object, producing a segfault. This issue has been fixed in version 3.17.2.
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Affected Vendors & Products
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History
Wed, 01 Jul 2026 13:30:00 +0000
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ssvc
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Wed, 01 Jul 2026 10:30:00 +0000
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Ohler
Ohler oj |
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Ohler
Ohler oj |
Wed, 01 Jul 2026 00:15:00 +0000
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| Description | Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, Oj::Parser in usual mode does not mark array_class and hash_class references during garbage collection, leading to Use-After-Free. If GC runs after the class is assigned but before a parse, the class object is reclaimed, leaving the parser holding a dangling VALUE. The subsequent parse call dereferences the freed object, producing a segfault. This issue has been fixed in version 3.17.2. | |
| Title | Oj: Use-After-Free in Oj::Parser array_class/hash_class GC Marking | |
| Weaknesses | CWE-416 | |
| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-06-30T23:36:38.526Z
Updated: 2026-07-01T12:34:23.576Z
Reserved: 2026-06-16T13:49:33.555Z
Link: CVE-2026-54901
Updated: 2026-07-01T12:34:09.073Z
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