Security Advisory

CVE-2026-54901

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-30 23:36:38

Last updated 2026-07-01 12:34:23

Assigner GitHub_M

CVSS score 6.3

State PUBLISHED

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.

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