CVE-2026-54500

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{"affected": [{"affectedData": [{"product": "oj", "vendor": "ohler55", "versions": [{"status": "affected", "version": "< 3.17.3"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Oj (Optimized JSON) es un analizador JSON y un serializador de objetos empaquetado como una gema de Ruby. En versiones anteriores a la 3.17.3, Oj.load en modo :object lee memoria de pila no inicializada (y, para claves largas, lee fuera de los l\u00edmites) al analizar un objeto JSON cuya clave tiene 254 bytes o m\u00e1s. Los bytes internados pueden llegar al llamador, revelando la memoria de pila del proceso. En ext/oj/intern.c, form_attr() maneja la ruta de clave larga asignando un b\u00fafer en el heap, \u2019b\u2019, rellen\u00e1ndolo con el nombre del atributo y luego liber\u00e1ndolo - pero pas\u00f3 el b\u00fafer de pila no inicializado buf (no \u2019b\u2019) a rb_intern3(). rb_intern3, por lo tanto, lee len + 1 bytes de memoria de pila no inicializada. Cuando la longitud de la clave es >= 256, tambi\u00e9n lee fuera de los l\u00edmites m\u00e1s all\u00e1 del b\u00fafer buf de 256 bytes. Los bytes resultantes son internados y pueden llegar al llamador a trav\u00e9s del S\u00edmbolo producido o a trav\u00e9s del mensaje de EncodingError generado por UTF-8 no v\u00e1lido, filtrando el contenido de la pila del proceso. Este problema ha sido solucionado en la versi\u00f3n 3.17.3."}], "id": "CVE-2026-54500", "lastModified": "2026-10-25T17:10:00.197", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54500", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-01T13:34:29.080763Z", "version": "2.0.3"}}]}, "published": "2026-07-01T00:16:32.147", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/ohler55/oj/security/advisories/GHSA-fm7p-mprw-wjm9"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-908"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"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"}

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