CVE-2026-54500

{"id": "CVE-2026-54500", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54500", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-01T13:34:29.080763Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "ohler55", "product": "oj", "versions": [{"status": "affected", "version": "< 3.17.3"}]}]}], "published": "2026-07-01T00:16:32.147", "references": [{"url": "https://github.com/ohler55/oj/security/advisories/GHSA-fm7p-mprw-wjm9", "source": "security-advisories@github.com"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-908"}]}], "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."}], "lastModified": "2026-10-25T17:10:00.197", "sourceIdentifier": "security-advisories@github.com"}