CVE-2026-54592

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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::Doc#each_child, when invoked recursively over a deeply nested JSON document, overflows a fixed-size stack buffer and aborts the process, leading to DoS. In a two-step chain in ext/oj/fast.c, doc_each_child increments doc->where past the where_path[MAX_STACK = 100] array with no bounds check and never restores it (the doc->where-- is missing), so calling each_child recursively from inside the yield block drives doc->where beyond the array. On the next entry the function copies the path into the 800-byte stack-local buffer save_path[MAX_STACK] using wlen = doc->where - doc->where_path, so when the previous recursive call left doc->where past where_path[100] the wlen exceeds MAX_STACK and the memcpy overflows save_path on the C stack; because the Oj::Doc parser imposes no JSON nesting-depth limit (relying on a C-stack pressure check), deeply nested attacker input reaches this path. This issue has been fixed in version 3.17.3."}, {"lang": "es", "value": "Oj (JSON Optimizado) es un analizador JSON y un serializador de objetos empaquetado como una gema Ruby. En versiones anteriores a la 3.17.3, Oj::Doc#each_child, cuando se invoca recursivamente sobre un documento JSON profundamente anidado, desborda un b\u00fafer de pila de tama\u00f1o fijo y aborta el proceso, lo que lleva a DoS. En una cadena de dos pasos en ext/oj/fast.c, doc_each_child incrementa doc -> where m\u00e1s all\u00e1 del array where_path[MAX_STACK = 100] sin verificaci\u00f3n de l\u00edmites y nunca lo restaura (falta el doc -> where--), por lo que llamar a each_child recursivamente desde dentro del bloque yield lleva a doc -> where m\u00e1s all\u00e1 del array. En la siguiente entrada, la funci\u00f3n copia la ruta en el b\u00fafer local de pila de 800 bytes save_path[MAX_STACK] usando wlen = doc -> where - doc -> where_path, por lo que cuando la llamada recursiva anterior dej\u00f3 doc -> where m\u00e1s all\u00e1 de where_path[100], el wlen excede MAX_STACK y el memcpy desborda save_path en la pila C; debido a que el analizador Oj::Doc no impone un l\u00edmite de profundidad de anidamiento JSON (confiando en una verificaci\u00f3n de presi\u00f3n de la pila C), la entrada del atacante profundamente anidada alcanza esta ruta. Este problema ha sido solucionado en la versi\u00f3n 3.17.3."}], "id": "CVE-2026-54592", "lastModified": "2026-10-25T17:10:00.197", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54592", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-01T12:35:37.238466Z", "version": "2.0.3"}}]}, "published": "2026-07-01T00:16:32.743", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/ohler55/oj/security/advisories/GHSA-3m6q-jj5j-38c9"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/ohler55/oj/security/advisories/GHSA-3m6q-jj5j-38c9"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-787"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "oj: Oj: Denial of Service via deeply nested JSON input", "id": "2495750", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2495750"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-120", "details": ["Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.3, Oj::Doc#each_child, when invoked recursively over a deeply nested JSON document, overflows a fixed-size stack buffer and aborts the process, leading to DoS. In a two-step chain in ext/oj/fast.c, doc_each_child increments doc->where past the where_path[MAX_STACK = 100] array with no bounds check and never restores it (the doc->where-- is missing), so calling each_child recursively from inside the yield block drives doc->where beyond the array. On the next entry the function copies the path into the 800-byte stack-local buffer save_path[MAX_STACK] using wlen = doc->where - doc->where_path, so when the previous recursive call left doc->where past where_path[100] the wlen exceeds MAX_STACK and the memcpy overflows save_path on the C stack; because the Oj::Doc parser imposes no JSON nesting-depth limit (relying on a C-stack pressure check), deeply nested attacker input reaches this path. This issue has been fixed in version 3.17.3.", "A flaw was found in Oj, a Ruby gem for JSON parsing. A remote attacker can exploit this vulnerability by providing a deeply nested JSON document. This can lead to a stack buffer overflow in the `Oj::Doc#each_child` function, causing the process to abort and resulting in a denial of service (DoS) for the affected system."], "name": "CVE-2026-54592", "public_date": "2026-06-30T23:16:24Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-54592\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-54592\nhttps://github.com/ohler55/oj/security/advisories/GHSA-3m6q-jj5j-38c9"], "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": "Important"}

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