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{"bugzilla": {"description": "Oj: Use-After-Free in Oj::Parser array_class/hash_class GC Marking", "id": "2495919", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2495919"}, "csaw": false, "details": ["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."], "name": "CVE-2026-54901", "public_date": "2026-06-30T23:36:38Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-54901\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-54901\nhttps://github.com/ohler55/oj/security/advisories/GHSA-vwm4-62gf-x745"], "statement": "Red Hat's only product shipping the Oj Ruby gem (Compliance Backend) already includes version 3.17.3, which contains the fix for this vulnerability. No Red Hat products are affected.", "threat_severity": "Moderate"}

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