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{"bugzilla": {"description": "oj: Oj: Information disclosure via uninitialized stack memory read", "id": "2495723", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2495723"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-125", "details": ["Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.3, Oj.load in :object mode reads uninitialized stack memory (and, for long keys, reads out of bounds) when parsing a JSON object whose key is 254 bytes or longer. The interned bytes can surface to the caller, disclosing process stack memory. In ext/oj/intern.c, form_attr() handles the long-key path by allocating a heap buffer, `b`, populating it with the attribute name, and then freeing it \u2014 but it passed the uninitialized stack buffer buf (not b) to rb_intern3(). rb_intern3 therefore reads len + 1 bytes of uninitialized stack memory. When the key length is >= 256, it also reads out of bounds past the 256-byte buf. The resulting bytes are interned and can reach the caller via the produced Symbol or via the EncodingError message raised on invalid UTF-8, leaking process stack contents. This issue has been fixed in version 3.17.3.", "A flaw was found in Oj (Optimized JSON), a Ruby gem. When parsing a specially crafted JSON object with a key 254 bytes or longer using Oj.load in :object mode, an attacker can trigger a read of uninitialized stack memory. This vulnerability, an out-of-bounds read (CWE-125), can lead to information disclosure of process stack memory. The leaked information is uncontrolled and can only be accessed if the application exposes the resulting Symbol or an EncodingError."], "name": "CVE-2026-54500", "public_date": "2026-06-30T23:08:28Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-54500\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-54500\nhttps://github.com/ohler55/oj/security/advisories/GHSA-fm7p-mprw-wjm9"], "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"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.17.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "oj", "source": "cna", "vendor": "ohler55"}, "product": "oj", "vendor": "ohler"}], "created": "2026-07-01T00:30:06.560099+00:00", "updated": "2026-07-01T13:30:15.503551+00:00", "vendors": ["ohler", "ohler$PRODUCT$oj"]}